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 box.