"Hey there,
From the sounds of it, you need someone to take care of your Stripe integration and revamp your app— give it some extra, "umph". You need a developer who understand the very basics of Android and who has experience in developing. Does that sound about right?"
"My experience of 2+ years will help you in achieving your goals and I'm very well versed with API Integrations"
Are you available on Skype? Can we continue this conversation there?"
"I have no doubt we can hit your deadline if you have any, but the sooner we get started the better. Send me a reply with any questions you have and let's get started today."
PS I'm flexible with timings.