Do you use Shopify's webshop solution?
If you use a third-party payment gateway such as Nets Easy, Reepay, PensoPay or Quickpay on your Shopify shop, then you need to set up the Shopify Payments interface (Shopify Payments API) in Shipmondo to capture/refund from Shipmondo.
NB! You don't need to activate Shopify Payments in Shopify, just the Shopify Payments interface in Shipmondo.
Follow the guide below to set up the Shopify Payments interface in Shipmondo.
Do you use a webshop solution other than Shopify?
If you use a webshop system other than Shopify, you'll need to follow the guide for setting up Quickpay's payment gateway (PensoPay's payment solutions is based on Quickpay's payment gateway).