Odoo payment acquirer integration

I have a working odoo 9 and I have made a contract with a payment service provider. I would like to integrate this service as a new "payment acquirer" to my existing odoo 9. Please note that there are two type of integration: 1- A redirection to the payment service provider page to make the payment. 2- Making the payment in the same check-out page, my check out page (POP-UP). When you bid please specify which type of integration are you referring to. There are another two odoo systems that needs the same integration in addition to other modifications, this one will be as a test. Kindly see the attached merchant integration file to get a better understanding about the request.