For UOB Online payment method there aren’t any test data available, but you can see how it works with the payment flow given below.
UOB Online Payment Flow
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The customer enters his email address, name and phone number.
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The customer is shown the details of his payment and proceeds to pay with UOB Online.
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The customer logs in to his UOB account by entering his User ID and password, and completes the payment.
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Upon completion of the payment flow, the customer is redirected back to your ReturnURL.