Step 1:
Go to Merchants → Gateway Integrations and scroll down until you see WorldLine
Step 2:
Click on the WorldLine tile then click the green “Activate” button
Step 3:
Log into your WorldLine Account and navigate to Account Settings → Order Settings to obtain your merchant_id and api_key
Step 4:
Enter the merchant_id and api_key tied to your WorldLine account then hit the green “Create MID” button to create your WorldLine mid in the CRM.