Decompile android app - find oAuth signature parameter -- 2

There's a service called Pinger at http://pinger.com. They have mobile apps, desktop and online clients. This service making https requests & each request using "Authorization" header. If authorization header is incorrect then server rejects request. All I need is correct "oauth_signature" Android app (JAVA) easily decompiles, but if obfuscated. Authorization happenes via the header "Authorization" Example of a header: OAuth realm="[login to view URL]", oauth_consumer_key="textfree-voice-iphone-free", oauth_signature_method="HMAC-SHA1", oauth_signature="vhZTADrPg%2BLUwggpm7hFYsZlqzg%3D", oauth_timestamp="1474539564", oauth_nonce="D736990A-DFD0-4BDD-ADC1-10D76FA66F9D" I already decompiled android apk and extracted the function which generates this signature but I can't find one string parameter which help generates this signature. I know it's pretty complicated description. If you're not familiar with Pinger, register account there, install app and clients. And if you need more info, just ask. I can provide decompiled java codes and a small java program in which I've written that apk oauth signature generation function. It's working but because I don't know one parameter that's why it's generating wrong signature. (Secret - 4458) Your task is either generate signature or just find that correct string parameter from that apk file so that I can generate correct signature. I've written a secret code in description, plz write that code while bidding else I thought you've not read it and ignore your bid. Thank you