hi, I'hv done work with O.P.I payment method already for one of my client as e-store web portal. I can do that for you quite perfect
Relevant Skills and Experience
Over the last 8 Years, I have made many live web based appliactions using PHP/MYSQL/Jquery,ajax,Javascript ,create Blogs,online book store websites and E-commerce websites
Proposed Milestones
$60 USD - Upfront
$217 USD - On Complete
About refunding system , you know that it takes hours to refund money vai that payment method