I am very new to reverse engineering and I am trying reverse my first API endpoint of a web app. I am using fiddler to analyze the form-data requests but both the fields and the values are very cryptic. I would post the dump sample here but I believe it contains some of my personal credentials. However I did notice that all of these requests have a sort of 'padding' at the beginning with basically the same string.  What could be the encoding? The purpose of the request is simply to update my location and fetch some new data.
API endpoint has cryptic request/response
encodings