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I using mmyy.All work ok in the sand box but not in Production. I was using new keys every time I review the code. Some times the error code is 0007, or 00018

The credit card is valid an the expiration date is not pass ... which format I have to use for the date format?mmyy or yyyy-mm?

How can we solve the error?CS told us they was a problem with authentication

Same problem here errorE00018