To delete a checking account payment profile, you'll need the token that was generated when you created it. Just plug that into the endpoint and you should be able to delete it. Since it's a DELETE request, there won't be a payload body.
For more information, see our article Secure Payments API – DELETE Customers Checking Account.
Try It Instructions
To get a new token, you should first use the Try It button on our Create Checking Account page. The response from that request will include a checking account token which you can then copy and paste into this request's endpoint.