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When a certain user payer has a purchase with status = Payment failed or Confirmation timeout * , payment for this payer will get automatically blockedand user will not be able to make any additional costs.
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In order to unblock the payer payment you have to do it manually in Ocean operator portal, find . Find this payer user under CRM > Payers and unblock it via Unblock Payment button.
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*Note that Confirmation timeout purchase status might be renamed to Payment retrying.