These installation instructions apply to the new Paytrail (formerly Checkout).
To install the module in your online store:
- Log in to your Shopify store.
- In the bottom left of the control panel, click "Settings" and then click "Payment providers"
- Select "Alternative payments". From the drop down menu, you will see two Paytrail options, select "Paytrail-maksupalvelu" and enter your merchant ID and secret key here.
- Click "Save", after which the payment methods will be available in your store.