In order for you to test 7-Eleven Pago en efectivo payment method successfully, you don’t need any given test data.
7-Eleven Pago en efectivo Payment Flow
The customer enters the required details: email address, first name and last name.
The customer receives a voucher with a barcode. In order to complete the payment, he needs to print the voucher with the barcode and pay it at any 7-Eleven store.