Hi,
Your project sounds very interesting and I'd be very glad to be involved. I believe I can provide great results as I'm very familiar with PHP, CURL and everything related to HTTP protocol and I have a lot of experience in APK reverse engineering. I have extracted data, ported functionality and modified several APKs, some of them quite popular. Please share more details, like the name of the app and required HTTP requests, so that I'll have a better understanding of the project.
Best regards!