add payment api to web site

i am in the process of creating an e-commerce web site with another coder. we are using asp.net c# to create the web pages i need you to write code to connect my web? page to the payment api that is? made available to me by the company that i am using? for credit card transactions. it is called first data merchant services? the product is called global connect cick here to see more information about the api <[login to view URL]>