For PSE Colombia payment method there aren’t any test data available, but you can see how it works with the payment flow given below.
PSE Colombia Payment Flow
The customer enters his Email Address, Name and CC. Please note that for Colombia the CustomerSocialSecurityNumber parameter consists of CC. For more information about the CC please click here.
The customer sees the payment summary and chooses the payment option.
The customer needs to enter the necessary details in order to complete the transaction.
Upon completion of the payment flow the customer is redirected back to your ReturnURL.