Fop apache java server jobs

My project involves packaging a Java application into a Docker image compatible with CentOS. This will extend the application's portability and scalability. Ideal Candidate: - Familiarity with Docker and Docker container management - Proficiency in CentOS Linux distribution - Experience packaging Java-based applications into Docker Images Requirements: - Transform the provided Java (or others compiled) program into a Docker image - Ensure the Docker image is fully compatible with CentOS - Verify the Dockerized Java program runs without hiccups on CentOS systems.

I'm in need of an experienced Android developer to update our Java-based app, originally designed for Android 5 KitKat, to work seamlessly on modern tablets. Key Requirements: - Improve User Interface: The project involves enhancing the app's existing UI. - Compatibility Upgrade: The current app is only compatible with Android 5 KitKat; the developer must ensure it functions smoothly on contemporary tablets. Additional Information: - The app currently consists of 6-10 screens or activities. - A new feature will be the integration of Bluetooth connectivity. -The app controls hardware via bluetooth, sends PWMs and reads ADC values and reads/writes to an rs232 info stream

I'm in need of an experienced web developer with strong shell scripting skills. While the main purpose of the website application is not specified, it's targeted at the general public. Ideal Skills and Experience: - Proven expertise in web application development - Experience in creating websites geared towards the general public - Robust skills in shell scripting - Ability to independently make decisions to enhance website functionalities Note: As the tasks for shell scripting are undefined, a flexible way of working is preferred for meeting emergent needs in the project.

I'm in need of an IT professional to set up an SMTP server on my Debian server. The primary purpose of this setup is to allow the server to send out automated email notifications for a custom-built application. Key requirements and expectations for this project include: - Setting up an SMTP server specifically utilizing Sendmail software on a Debian server - Ensuring that the configuration is optimized for automated email notifications - Providing guidance or documentation on how to integrate the SMTP server with my custom-built application Ideal candidates for this project should possess the following skills and experience: - Proficiency in working with Debian servers and setting up SMTP servers - Prior experience with Sendmail configurat...

I'm looking for a skilled software developer who is proficient in Java and familiar with the DJI drone SDK. Seeking individual with HTTP and DJI SDK experience to add features to DJI Ground Control Software. The application must transmit and handle HTTP REQUEST to server, display popup messages, play notification audio, and auto-upload waypoint to a selected drone. Key requirements: - You must have experience in software development on Windows OS. - Proficiency in Java is a must. Experience with DJI drone SDK is highly preferred. - The main feature to be added to the software is automatic drone flight path planning. Key responsibilities: - Integrate the DJI drone SDK into my existing software. - Implement automatic drone flight path planning feature. This pro...

I'm in need of a skilled and experienced games programmer to help me create a mobile game with a strategy genre. The ideal candidate for this project should have the following qualifications: - Proficiency in C++, Java, and Python, as these are the languages I'm familiar with and would like to use for this project - A proven track record in developing mobile games, with a preference for strategy games - Strong understanding of game design principles and mechanics - Ability to work collaboratively, take direction, and provide valuable insight and feedback - Excellent problem-solving skills and a keen eye for detail If you have the necessary skills and are passionate about creating engaging, high-quality mobile games, I'd love to hear from you. Please provide examples...

I have a PostgreSQL database hosted on AWS. When trying to connect to my database server from my web application, I'm consistently receiving a TCP/IP error. Key Project Points: - The issue is specifically related to the TCP/IP connection between the web application and the AWS PostgreSQL database server. - The PostgreSQL database is hosted on AWS; it's not a local instance. - The web application is the only service experiencing this issue with the server. Ideal Freelancer: - Proficient in AWS services, particularly Amazon RDS for PostgreSQL. - Strong background in dealing with network errors, particularly TCP/IP. - Experience in troubleshooting web application and database connectivity issues.

...provide a sound alert to notify me. Key Details: - The program needs to be fast to cater for frequent changes in millisecond time-frames. - I don't have a preference for a programming language. Python, Java, and C++ are all acceptable. - At this stage, I'm unsure which order flow software I'll be using. Therefore, the program needs to be built with adaptability in mind to synchronize smoothly with any potential order flow software. - A sound alert should be triggered whenever a three-digit number pops up. Ideal Skills and Experience: - Proficient in programming languages (especially Python, Java, C++) - Experience in developing real-time monitoring software - Understanding of trading platforms and order flow software - Excellent problem-solving abilities...

I'm in need of an experienced Java Script developer that can resolve a peculiar issue with my implementation. Here are the specifics: - All of the data I'm showcasing are ALL DAY events. - The events are not appearing in the Week and Day views, however, they do display as expected in the Month and List views. - I am using a version of that's not the latest. I'm looking for a professional who can: - Investigate the issue and implement a fix to ensure the ALL DAY events are correctly displayed across all views. - Offer advice on whether updating to the latest version of would help address the problem. The ideal candidate should have: - Profound experience in Java Script development. - A deep understanding of functionalities and

Looking for a Senior BDA with experience in. AZURE SQL SERVER. English mandatory. 1d per week helping to improve and maintain our main DBs.

I have a small server infrastructure and I am looking for a System Administrator who has a strong knowledge of Linux and can handle Apache Logs. This role would primarily involve: - Monitoring system performance. - Troubleshooting issues. - Ensuring security of the servers. Skills and Experience Required: - Proficiency in Linux system administration. - Experience in handling Apache Logs. - Strong troubleshooting and problem-solving skills. - Knowledge of security best practices for server infrastructure.

Hello After a reboot of a server our cpanel not working anymore, need urgent helpwith IMMEDIATE availability

Looking for an android developer Java,Kotlin,JSP, Servlets, MQ series, Hibernate, Python, Microservices, Swings, WebSphere-Portals, HTML5, Bootstrap, JavaScript, Bigdata, Linux Frameworks Android Mobile App Development, Spring boot, Struts, Hadoop This will be ongoing

I'm in need of an experienced Android developer to create a productivity app that primarily focuses on calculations. Key Features: - The app will be centered around calculation functions - Users should be able to make basic arithmetic ca...of an experienced Android developer to create a productivity app that primarily focuses on calculations. Key Features: - The app will be centered around calculation functions - Users should be able to make basic arithmetic calculations - The app needs to be user-friendly and intuitive for quick calculations Ideal Skills and Experience: - Strong background in Android development, proficient in Java or Kotlin - Previous experience building productivity apps - Prior experience working with calculation functions - A good understanding of UX/UI...

We are seeking a skilled developer to set up and program a framework using Apache Kafka for distributed messaging. The project aims to establish an efficient and scalable messaging system that can handle high-volume message processing and filtering. Project Overview: The developer will be responsible for setting up Apache Kafka on a Windows environment and developing a master script and worker scripts to facilitate distributed messaging. The key requirement is to implement a mechanism for bulk-reviewing messages in the queues every 10 minutes to filter out unnecessary messages and optimize system performance. Responsibilities: Apache Kafka Setup: Install and configure Apache Kafka on a Windows machine. Set up the necessary Kafka topics, partitions, and brokers...

I'm in need of a skilled programmer to develop a script that can serve as both a Man-in-the-Middle (MITM) and a Reverse Proxy tool. The primary goal of this script is to assis...restrictions. Key Project Requirements: - The script should be compatible with Windows, MacOS, and Linux. - It should effectively intercept network traffic and support the following network protocols: HTTP, HTTPS, and TCP. - The script should also have the capability to act as a Reverse Proxy tool when needed. Ideal Skills and Experience: - Proficiency in programming languages like Python, C++, or Java. - Experience in developing network security tools or reverse proxy systems. - Knowledge of network protocols and their interactions. Please, only bid on this project if you have the necessary skills ...

I'm looking for a server administrator with intermediate Drupal experience to handle ongoing maintenance. Key responsibilities include: - Monitoring the server's performance and troubleshooting any issues that arise. - Ensuring the server remains secure and up-to-date with the latest patches. - Regularly backing up the server's data to prevent loss in case of failure. - Updating and maintaining the Drupal installation, ensuring compatibility with the server setup. Ideal skills and experience: - Proficiency in Linux server administration and management. - Intermediate level of experience with Drupal, including installation and configuration. - Strong troubleshooting and problem-solving skills. - Understanding of best security practices for server...

The developer should have the following skills and experience: 1. Proficient in Java, Kotlin and other programming languages; 2. Have a deep understanding of Android platform, familiar with Android SDK and related tools; 3. -- If you have an already published app you can! Out -- for s-a-l-e! . If you are interested, please feel free to contact us and look forward to further communication with you.

Bought a react eCommerce template (front-end & back-end) from theme-forest. Provided documentation is not enough for server side installation. I need professional assist to install the project on server side and install the theme on server side.

I'm searching for an experienced Android developer to work on a self-help app that...app is to track the user's progress. Key Features: - User Registration and Login: The app should incorporate a straightforward registration and login system to ensure user engagement. - In-App Purchases: It's essential that the app supports in-app purchases to enable users to access premium content or features. The developer should have the following skills and experience: 1. Proficient in Java, Kotlin and other programming languages; 2. Have a deep understanding of Android platform, familiar with Android SDK and related tools; 3. -- If you have an already published app you can! Out -- for s-a-l-e! . If you are interested, please feel free to contact us and look forward to furthe...

I'm seeking an Android developer with a strong grasp of Java programming, Android SDK, and UI/UX design for a straightforward project. Key Features: - The app should be capable of user authentication. Primary Goal: - The main objective is to create a basic calculative with admin approval of features and scrollong images which can be changed application. App is similar to video attached The ideal candidate will have experience in developing clean, user-friendly Android applications with a focus on accurate calculations. Experience in UI/UX design is a plus, as we aim to provide a sleek and intuitive user interface.

We are seeking a skilled developer to create a self-service car wash system that can be used on both Andr...system should allow users to easily locate nearby car wash stations, select their preferred service package, make payments, and receive notifications. The ideal candidate should have expertise in Android and iOS app development, as well as experience with GPS integration, payment gateways, and push notifications. 1. At least 2 years of experience in Android application development 2. Proficient in Java or Kotlin programming languages and Android development tools and frameworks 3. Have a certain understanding of mobile application design and user experience 4. If you have published applications for s-/--a--/--l---/-e, I am interested and look forward to further communicatio...

I desperately need to get apps, especially those available on the Google Play Store. My interests lie in a broad range of application types, including gaming, tools, lifestyle, entertainment, and news applications. All applications except finance, wallpapers. And requires a certain amount of downloads. key point: Have a certain number of downloads - The apps should be available on the Google Play Store. Make sure the source file signature file is complete. - I am particularly interested in games, tools, lifestyle, entertainment and news apps. Your role is to sell me the rights to your application. Experience using applications in these specific categories (games, tools, lifestyle, entertainment, news) will be a major advantage.

...Rest Assured to implement it in an API testing project at work. Key Requirements: - Experience in Java, BDD, Serenity framework, and Rest Assured - Able to guide and teach on: - Understanding an automation project - Creating and executing tests - Reporting - GIT Integration The project is centered around API testing, so any specific experience here is a plus. I'm looking for a patient, experienced professional who can help me grasp the fundamentals and guide me through the intricacies of implementing automation with the mentioned frameworks. There are existing scripts in place which I need to understand and also create new scripts and execute on my own. Ideal Skills: - Strong Java background - Experience in BDD - Expertise in Serenity framework and Rest As...

I'm looking for a skilled professional who can solve advanced level CTF challenges, in various categories. I need someone who can tackle challenges in Web Exploitation, Binary Exploitation, Cryptography, as well as other categories like web, forensics, osint, and more. Key Responsibilities: - Solve advanced level CTF challenges ...experience with CTF challenges - Proficiency in solving challenges in Web Exploitation, Binary Exploitation, Cryptography, web, forensics, osint, etc. - Proven track record of solving advanced level CTF challenges - An understanding of security concepts Please note that the specific programming languages or platforms to be used in solving the challenges are not specified, but your background in Python, Java, C++, Ruby, or other relevant languages ...

I'm seeking the expertise of a seasoned developer to create a customized chat f...in building similar platforms will be a significant advantage. - Media Sharing: The chat interface should be modern and dynamic, capable of handling in-message media sharing. This means users should be able to share images, videos, and other rich media content within the chat conversation seamlessly. If you've designed such interfaces before, you're the person I'm looking for! Skills such as Java, Python, or PHP are desirable. Exceptional knowledge of web sockets is a must for real-time chat functionalities. An understanding of user experience is also essential, as the platform must be user-friendly. I'm open to suggestions on how to make this project a success, experience i...

I'm seeking assistance with an urgent issue that's emerged with my softphone engine. - **Operating System**: My system is running on Windows. - **Programmin...issue that's emerged with my softphone engine. - **Operating System**: My system is running on Windows. - **Programming Language**: Unfortunately, the programming language of my softphone engine has been omitted. I believe it may be C#, Java, or C++. It's imperative that the freelancer is comfortable with these languages to handle the issue. - **Timeline**: I'm in need of immediate assistance to solve this problem. Ideal candidates should be able to troubleshoot softphone issues and have experience with Windows software development. Experience with C#, Java, and C++ is a plus. The ability to...

...including ID cards, receipts, invoices, paper, and passport photos, and saving them in JPEG format. As such, the app should be able to: - Recognize and accurately scan ID cards, receipts, invoices, paper, and passport photos - Provide a seamless and user-friendly experience for scanning documents - Showing Auto or Manual Edge Cropping, Image Rotation - Using OpenCV - Native Android (Android Studio), Java I would like the app to be specifically tailored for Android, ensuring a smooth user experience and a clean, intuitive interface. Ideal Skills and Experience: - Proficiency in Android development - Experience in developing document scanning apps - Familiarity with image recognition and processing - Ability to create a simple and user-friendly interface - Knowledge of saving...

I'm seeking a skilled REDM game developer, who takes a particular interest in creating a Roleplay server on the REDM network. Expertise in developing game mechanics are key for this project. The primary task involves: - Developing a Roleplay server game. - Incorporating customizable characters, multiplayer functionality, and an in-game economy system. A successful freelancer will have a good understanding of how to create immersive and engaging Roleplay environments, and experience in implementing character customization options, multiplayer functions and economy system into such a game. Candidate should possess expertise in REDM server game development and game design principles. A proven track record in similar projects will be advantageous.

I'm looking for a skilled AWS expert to help me set up a highly performant proxy server that can support multiple protocols. Key requirements include: - Setting up the proxy server in AWS - Configuring elastic IPs for the proxy server - Ensuring it runs at an optimal performance level - Supporting multiple protocols The proxy server should be designed to accommodate a high volume of traffic and provide a seamless, fast browsing experience. Ideal candidates should have: - Extensive experience with AWS services - Proficiency in configuring and managing proxy servers - A strong understanding of networking and server optimization Please bid with a clear outline of how you plan to approach this project, including any relevant experience you have that...

I require a skilled Linux administrator to assist setting up a server on my local machine. I currently have a domain, cloudflare, WSL, ubuntu, ollama and ollama webui. I'm getting stuck on connecting my domain through cloudflare tunnel to my linux server so that I can access ollama's webui remotely. Key Responsibilities: - Install and configure Linux server for accessing the Cloudflare tunnel website - Ensure the server is optimally configured for devices outside the network Ideal Skills: - Proficient in Linux server setup and administration - Experience with Cloudflare tunnel configurations - Knowledgeable about server configuration for network accessibility - Background in IT security to ensure secure network access. -Experience with...

I have a source code for android video streaming app in java, xml, and i need to change the design of the app frontend I am looking for someone who can make changes to android app code design and recreate the frontend. below i have attached the design of my app, and want to reformat it according to zee5 app design. If you feel its a good fit for you, i welcome your bid. thanks.

Overview: We are looking for an experienced Java developer to refactor an existing code base to incorporate several design patterns and improve overall code quality. This project involves enhancing the structure and maintainability of the code by integrating various design patterns, such as Dependency Injection (DI) using Google Guice, Listener, Builder, Singleton, and, optionally, Factory design patterns. The ideal candidate should understand these patterns strongly and have experience refactoring legacy code. Key Responsibilities: 1. Refactor Service Classes with DI Pattern: - Utilize Google Guice API to implement Dependency Injection across all service classes. - Ensure that all dependencies are injected and managed by the Guice framework. 2. Apply Listener Design Pattern...

I'm looking for an experienced and knowledgeable SQL Server professional who can help me resolve a connection issue I'm experiencing. - **Connection Method**: I'm currently using Windows Authentication to connect to the SQL Server. - **SQL Server Version**: I'm using SQL Server Management Studio 20. - **Error Message**: When trying to connect, I receive an error message indicating that the connection has failed. Ideal candidates for this project should have: - Extensive experience with SQL Server, particularly with the version I'm using. - Proficiency in troubleshooting connection issues. - Strong communication skills to guide me through the resolution process.

I'm seeking a professional to help set up a Windows-based server using virtual machines for the purpose of managing remote profiles. Key requirements: - Proficiency in setting up and configuring Windows Operating Systems - Experience in creating and managing Virtual Machines, particularly in a VPS environment - Prior work in server configurations and network management The ideal candidate will be able to work efficiently, communicate effectively, and provide guidance on scalability and security for the server setup.

...experienced Java developer who can integrate a cloud-based database into my project. Ideal Skills: - Strong proficiency in Java - Prior experience with database integration - Specifically, experience with cloud-based databases, Microsoft Azure in particular, is a big plus The Project: - Your primary task will be to integrate Microsoft Azure, a cloud-based database, into an existing Java project. - The project already has a well-defined structure and the database will serve as a key component. - The database integration should be secure, efficient, and scalable, meeting the highest standards. - There will be no need for user authentication or API integration, as this project is solely focused on database integration. Please only apply if you have good experienc...

Hello, I would like to hire someone who can create a complete discord server, with bot design, channels, etc.

I'm requiring a proficient Java developer for a college project. The main task will be building a web application along with database integration. I'll need you to implement vital functionalities, such as: - A user registration panel - A user login page - Fee structure - Contact us section - Admin as well as user registration option - Subjects and courses - Basic website navigation functions For the front end, HTML and CSS skills are necessary to render a clean and minimalist design. It's vital you're experienced in these domains and can provide examples of your past work. Looking forward to your proposals.

As someone who values efficient and cost-effective operations, I'm intent on leveraging the full potential of my Microsoft SQL Server database. The core of this project involves enhancing performance and decreasing cost. To enrich the function of my database, I'll need an expert who can: - Improve overall performance, guaranteeing smoother, faster operations - Implement strategies for cost reduction without compromising quality and performance The ideal freelancer will be someone with extensive experience in Microsoft SQL Server, superb knowledge in database performance enhancement, and proven strategies for cost-reduction. If you can deliver this, you'd be the perfect fit.

...have 2 chapters to finish. in those 2 chapters i need your help on coding. my subject being the digitization of the conversation between a person with hearing loss and a doctor. my desire from you is to program my java application itself as long as you can, it doesn't have to be complete finished. the application has the idea of ​​how you enter it, it puts you in a picture interface, the deaf-mute person does his sign language, and the translation appears below. if you can help me with explanations and about which package to buy from you that would be perfect, thanks! 1) Set up the Java project and the necessary libraries for computer vision and machine learning. 2) Capture video input from a camera. 3) Pre-process the video frames to enhance th quality and reduce no...

I'm in need of an Android developer with experience in Java and Kotlin who can handle issues with fingerprint scanner devices like Futronics FS80H and Mantra MFS100 on Android 14. Key Responsibilities: - Diagnose and resolve compatibility issues with the latest Android 14 version. - Ensure the scanner can correctly detect fingerprints. - Ensure the scanner is responsive and functions as expected. Ideal candidates should have: - Proven experience working with fingerprint scanner devices. - Expertise in Java and Kotlin for Android development. - Strong knowledge of Android 14 and its compatibility requirements. - A track record of troubleshooting and resolving technical issues. This is an urgent project, and I'm seeking someone who can deliver results promptly and ...

We are seeking an experienced full stack developer proficient in Angular, Typescript, Java, and Spring to join our team for an exciting HR Tech project. This project aims to streamline the onboarding process for candidates while enhancing the efficiency of recruitment for companies. Key Features: 1. Onboarding Process: The platform will feature a comprehensive onboarding process for candidates, designed to facilitate a smooth transition into their new roles. This process will consist of four main steps: - Technical Quiz: Candidates will undergo a technical quiz to assess their domain-specific knowledge and skills. - Audio Recording: Candidates will be prompted to record audio responses to predetermined questions, allowing recruiters to gauge communication skills and confidence. -...

I am looking for someone to redesign the frontend of Apache Superset, specifically the landing page and menus (Mu instinct is that this will take about a day for the right freelancer). I am looking for someone with the following skills and qualifications: Proficient React.js Developer: Superset's frontend is built using React.js, a popular JavaScript library for building user interfaces. The candidate should have extensive experience working with React.js and be well-versed in its concepts, such as components, state management, and lifecycle methods. Familiarity with Redux: Superset utilises Redux for state management. The ideal candidate should have a solid understanding of Redux principles, including actions, reducers, and middleware. Strong CSS and Styling Skills: Redes...

I'm in search of a skilled automation tester who has ample experience with Java. My project involves developing a new module that requires comprehensive functional testing. Use Frame work is POM Key Responsibilities: - Implement, design, and create functional test automation frameworks with Java - Thoroughly perform functional testing on new modules Ideal Skills and Experience: - Proficient in Java - Extensive experience in functional testing - Familiarity with Selenium Preference will be given to those who can demonstrate specific experience with using Selenium for automation testing in Java. Remember, quality is crucial. I'm not looking for rushed testing, but a methodical and precise approach. Get in touch. link of implementation :

I'm in need of an experienced individual to migrate my current Moodle site from a shared server to a dedicated server. This move is primarily to prepare for an expected increase in traffic, and I'm looking for someone who can not only handle the technical aspects of this migration but can also help with optimizing the server for improved performance. Key Requirements: - Expertise in server migration, specifically Moodle - Ability to create a custom configuration for performance optimization - Prior experience in handling increased traffic on a dedicated server Please only apply if you have experience with Moodle and can guarantee a smooth migration process.

I'm looking to expand my current portfolio and am interested in purchasing Java-based apps that are already on the Google Play Store. The types of apps I'm particularly involved in include games, utilities, and productivity software. - Types of Apps: Games, Utilities, Productivity - Type of Purchase: Both Individual apps and app bundles are welcomed. - Programming Language: Java-based apps only. For this project, an ideal freelancer would be proficient in app development using Java and has direct experience in uploading and maintaining apps on the Google Play Store. Any freelancers who already have ready-apps that meet the criteria would be preferred. Please include screenshots or links to your app/s available on the Play Store, along with your bid. Let&...

...experienced Netapp server hardware engineer to help me with troubleshooting, configuring, and installing server components. Key Tasks: - Troubleshoot hardware issues: The server is experiencing hard disk and motherboard failure, leading to performance issues and potential data loss. The ideal candidate will be proficient in diagnosing and resolving these hardware problems promptly. - Configuring Netapp server: I require assistance with configuring the server to ensure optimal performance and security. Proficiency with Netapp server setup and configuration is a must. - Installing server components: The successful candidate will also be responsible for installing new hardware components to replace those that have failed. Ideal Candidate:...

I'm in immediate need of a DNS server implementation using UDP sockets in Go. The primary purpose of this server is to resolve domain names to IP addresses within the shortest possible time frame. Key Requirements: - Implementation of a DNS server in Go - Utilization of UDP sockets for communication - Support for resolving domain names to IP addresses - Ability to run on multiple platforms, including Windows, Linux, and macOS Ideally, I'm looking for a freelancer with: - Proven experience in developing DNS servers - Proficiency in Go programming language - Strong understanding of UDP sockets - Ability to ensure cross-platform compatibility - Immediate availability to complete the project ASAP Please provide a brief overview of your relevant experience, you...

NOTE : this is for futures .. max budget is $300 *** please submit, only if you have worked on BOT projects for crypto exchange*** I'm seeking a skilled developer to create an automated trading system that can...require seamless integration with the MEXC platform. Skills and Experience Required: - Strong knowledge of algorithmic trading and cryptocurrency markets - Proficiency in building automated trading systems, particularly on the MEXC platform - Experience in developing and implementing trading strategies - Understanding of real-time market data analysis - Proficiency in coding languages such as Python, Java, or C++ Please only apply if you have a proven track record in building similar systems and are able to deliver a reliable and effective trading bot for the MEXC ...

I'm looking for a skilled and experienced freelancer to help me with a mobile app project that comprises both UI/UX design and Java Backend development. Key Requirements: - Proficient in UI Design: You'll need to create a sleek, intuitive, and user-friendly interface for a mobile platform. - Java Backend Development: The app needs to have a robust and efficient Java backend that can handle the expected load and ensure seamless functionality. - Mobile Platform Experience: You should be well-versed in mobile app development, ensuring the final product is optimized for mobile use. Specific Features: - User Authentication: The app will need a secure and reliable user authentication system. - In-App Purchases: You'll need to implement an in-app purchase sy...