Email your request to the support team to obtain sandbox credentials to use Obtain a token.
2.
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. Read the document further to know on how to obtain these values.
Now you are good to create a card or payment request and start integrating.