For Online Banking Thailand payment method there aren’t any test data available, but you can see how it works with the payment flow given below.
Online Banking Thailand Payment Flow
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The customer enters his Email Address, Name and Phone Number, and chooses his preferred payment option from the given list. 
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The customer enters the details required to login to the selected bank in order to make the payment. 
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Upon completion of the payment flow the customer is redirected back to your ReturnURL. 


