Find the Encryption of a request

Hi I need someone to reverse engineer a specific game's requests to its server. The end goal is to be able to decode, change and re-encode our own version of the request to the server. I have the JSON/fiddler requests already if you need an example of what the encryption looks like. PS: This is an android game, so you should have experience reverse engineering parts of android games. PPS: This is not HTTPS/SSL encryption - that part is already decrypted. you have to drag a jigsaw in a hole to complete the picture