If you are provided with a Token instead of Card details and what to Test the Token, please follow the steps.

1. Create a Recurring Payment record. Add the Token to the Billing Token field.

2. Then do a Token Charge.

Please see the link on how to take Payments via Token charge feature of Payments2us.

https://help.payments2us.com/m/userguide/l/239531-how-to-make-an-additional-payment-to-a-recurring-payment-token-charge