Log into your Shopify administration. Go to Preferences -> Checkout & Payment
Find ‘Credit Card Gateways’ under Accept Credit Cards
and choose ‘ePay / Payment Solutions’ from the dropdown menu (see image 1).
Enter your merchant number in the field “Merchant number”. This is either a test merchant number or a production merchant number.
Enter the domain, from which your Shopify shop is running, in the field “Referrer URL”. E.g. myshopify.com.
It is important that you also enter this domain in your Bambora administration in Settings -> Payment System
Save your installations by pressing ‘Activate’ at the bottom the Accept Credit Card