Creating a registration form.

Hi, I am creating a phone application but i had a little problem with the registration form and payments. So I decided to create a webpage for the registration and payments such merchant account and paypal so who want to register in my app he has to pay first. and this page will be connected to my application. so if i open my application and put sign up it will open a web page with registration form and payments information so after i fill that up i can access my application. I have a domain. This has to be a quick job like 2 or 3 days maximum. Please make your bid and how long it will take. and i will get in touch with you.