Pinger TextFree oAuth Signature Generation

There's a service called Pinger at http://pinger.com. They have mobile apps, desktop and online clients. Each app uses OAuth authorization, it's different for different requests. Android app (JAVA) easily decompiles, but if obfuscated. Authorization happenes via the header "Authorization" Example of a header: OAuth realm="[url removed, login to view]", 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 *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"