For Yandex payment method there aren’t any test data available, but you can see how it works with the payment flow given below.
Yandex Payment Flow
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The customer chooses the payment currency from the list.
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The Customer logs in to his Yandex.Money account with his username and password.
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The customer sees the payment summary and he confirms the payment by introducing the payment password.
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The customer receives the payment confirmation.
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Upon completion of the payment flow the customer is redirected back to your ReturnURL.