3. Select the preferred payment methods and currencies within your Payrexx account by clicking on "Add/ remove payment methods".
Afterwards, you need to copy and paste the test API key of your Mollie account to your Payrexx account. To do so, proceed to "Settings > Website Profile > Live and Test API keys" within your Mollie account and copy and paste your "Test API Key" to your Payrexx account. You can now test payments with one of the Payrexx tools.