[AlphaCommerceHub] The `RefundPayment` scenario for bank cards is broken again since 2017-12-14: «Invalid merchant»

Extensions AlphaCommerceHub
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The error is random.
Sometimes, a duplicate refund helps to overcome this AlphaCommerceHub’s API bug.
But be careful!
Due to its strange architecture, AlphaCommerceHub allows to refund much more money, then it was captured.
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