Email your request to the support team to obtain sandbox credentials to use Obtain a token.
2.
Sandbox does not need onboarding. Use the Resurs test stores and their payment methods. See 8. Test Data below.
3.
In order to initiate a payment you will have to make sure valid values are set to these properties.
ResursChannelOptions
You can find this property in the "options" field of the Create a new payment request request body. See 3. Payment Request Fields below for what each value means and where to get it.
4.
Set the payment channel and the collection prompt channel. See 2. Payment Channel and Collection Prompt below.
Now you are good to create a card or payment request and start integrating. Test data is available under 8. Test Data.