Help APP with Signkey mismatch

Is there a kind person who is willing to take that extra step of sincerity in helping a male with very low income and can only offer $10.00 for my project. My app is finished, but keeps getting rejected on Google plyconsole no matter how many times a key request is made... (Budget: $10 - $30 USD, Jobs: App Publication, App Store Optimization, App Usability Analysis, Backend Development)