Hello Mate
Yes I have working 8+ year experienced with APIS like dropbox, youtube, skype , SMS , etc if you provide project details so i can share my suggestion & assistance how we can use required apis & how we customise thier respond at which level .
As we knew most of are free apis , but They have already limitation . that's why I am asking for project details .
Ending my writing with hope we can communicate ASAP .
Thank you