Hello,
I can code a simple PHP script to make it done. I can use this PHP SDK to complete this project: [login to view URL]
If you want more advanced system for your future use, I can also make it done.
I have 10+ years PHP, CSS/HTML, JavaScript and MySQL experience. I am also very experienced with web services like XML, JSON. I've complete similar tasks (about Mailchimp) before.
Please send me a message to discuss the details. I can complete this task within 2 hours.
Thank you.