For PSE payment method there aren’t any test data available, but you can see how it works with the payment flow given below.
PSE Payment Flow
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The customer enters his email address.
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After selecting the payment method, the customer enters the required information and proceeds with the payment using the Pay button.
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The customer enters his email address registered in PSE and completes the payment.
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Upon completion of the payment flow, the customer is redirected back to your ReturnURL.