When setting up a Card Connect account in PeopleVine, you will first need to request the production credentials from Card Connect directly. You would need these for their REST API.
To set this up:
In PeopleVine go to the company menu (click on your company name) and then click on Payment Processors.
Create a new processor and select Card Connect.
Enter in the API username, password and merchant ID they provided you.
Select the relevant options and you're now able to accept payments in PeopleVine.