Consultation and expertise in international flight API's and their integration.

Good afternoon, I am looking for an affordable, detailed and flexible flight API for a new travel website. While doing my research, i found a similar project that seems very similar. (https://www.freelancer.com/jobs/PHP-ASP/Amadeus-Galileo-Sabre-GDS-Integration/?utm_expid=294858-308.2oso58FbRsuhR3xCT4EBFA.0&utm_referrer=https%3A%2F%2Fwww.google.co.th%2F) I'm making an inquiry on the subject of your experience in flight search API's,their characteristics and details. What i am looking for is an API to help my users search and find the best value flights in combination with their time scale. I do not require the whole website to be built, i need your professional expertise and consultation more than anything. So i am offering you to become an advisor for my project, we can discuss a payment if this is something you can do. I need an API that can do the following, is affordable and available for purchase and injection into website backend. Does it provide ticket prices? Are the amount of tickets already sold for a flight viewable? What kind of documents do i need to provide in order for me to use it? How much would it cost? Are there any application forms or documents i will have to fill in and provide? Please send me a message and we can discuss your involvement in this project and the payment. Thank you for your time, Hektor