Working with digest

Hey Could someone help me with Decrypting a Digest and Creating a Digest to make a HTTP Request?

If I want to post a request something like this , How do I generate a digest

  CONTENT "loginid=<U>&password=<PASS>&timestamp=<UNIX>&digest=<digest>&ticket=2&service_id=mailapp" 
  CONTENTTYPE "application/x-www-form-urlencoded" 
  HEADER "Connection: close" 
  HEADER "Content-Type: application/x-www-form-urlencoded" 
  HEADER "Host:" 
  HEADER "User-Agent: okhttp/4.9.3" 
  HEADER "Accept-Encoding: gzip, deflate" 
  HEADER "Content-Length: 167" 

The Digest generated by the Apk It self is likely in the form like down**449ecb8fcf9f3ca0fd7cc28d30c6cfb312eaac569401646ea6b304dc282ea9f6**&ticket=2&service_id=mailapp

This “digest” is probably a hash generated by the application itself, I recommend looking in the APK where it is generated or looking to see if it is being received in any previous request.

It was not generated in any previous requests

I am just stupid enough to not know how to find secret from the src of the apk

I have the config with the solved digest.

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