API INTEGRATION. IN SUBSCRIPTION BASED ECOMMERCE SITE

WE SELL SUBSCRIPTION BASED SERVICE. ON SITE WWW.OURSITE1.COM. THE CLIENTS CREATE AN ACCOUNT ON OUR SITE THEN PAY FOR THE SUBSCRIPTION. AND THE ACCOUNT IS CREATED AFTER PAYMENT IS MADE. NOW WE NEED SOMEONE TO BE ABLE TO CREATE SAME ACCOUNT LOGIN INFORMATION ON [login to view URL] GIVING ACCESS TO OUR CLIENT TO BOTH SITES. PLEASE WHEN YOU APPLY TO THIS PROJECT INCLUDE WORD I DID IN YOUR MESSAGE.THANKS. IN OTHER WORD CLIENT WHEN HE JOINT US ONLY NEED TO FILL ONE FORM TO CREATE ACCOUNT ON BOTH [login to view URL] AND AN API WILL AUTOMATICALLY CREATE SAME CREDENTIAL ACCOUNT ON OUR SECOND SITE [login to view URL] WE HAVE THE API JUST NEED TO INTEGRATE IT IN [login to view URL] THANKS