Search our knowledge base: Index  -  FAQ - Error Messages  Details Frequently Asked Question (FAQ) Document Number: 330 Optimize for Printing E-Mail This Link  Feedback This document ... helps resolve my question or problem. does not apply to my question or problem. is inaccurate for my question or problem. -39: ERROR_LENGTH_SERIAL_NUMBER This means that the gateway "Username" in "Payment/Gateway Settings" in the "Cart Settings" section of the cart, is invalid.

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