Hello sir,
We are a team of CORE Mobile application Developers and completed so many projects on Android,Iphone,PhoneGap etc. I understand that you want an android app which integrates opentok, AliPay and Twillo API/SDKs.
I have study the the entire project and want to discouss the project with you in detail.
We are working with the team of 67 developers here and very much capable to handle this project.
I can assure you to get this project done by my most Sr. developer, if i get opportunity to work on this project.
Kindly contact us in chat window to initialize quick chat regarding this project.
Best Regards.
Pragati Shinde