Sub for sub is an android app where users can promote their youtube channels to get more real subscribers anf archive their goal. we have made an app using youtube official data api v3 along with In_App purchase and credit system. Users can get credit by subscribing others channel and in this way this way that can promote their own channel using the credit. and we also implemented live chat system so if the user having any issues , they can directly contact you throught live chat. full documentation available
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