You may get result code 26 if:

• The account has just been created. A vendor account doesn't become active until at least an hour after being created. Typically, a database update begins at 20 minutes past the hour and lasts about 20 minutes. If your account becomes active during the database update, it cannot be used until after the next hour's update.
• Login information is incorrect. Verify the information you entered in the User, Vendor, Partner, and Password fields.
  • Check that the correct Partner value was sent.
  • Vendor is your Merchant ID.
  • The primary user's Merchant ID should be in the User field. For a secondary Payflow Pro user, the User field should contain the password assigned by the primary user.
  • All fields are case-sensitive.
• The bank BIN number is unknown. For PayPal Australia (VSA) only, result code 26 indicates that a credit union or small financial institution issued the customer's credit card. The processor, FDRA, has no bank identification number (BIN) on file for the card, which triggers the error message "No Universal Account - Response code 42." You must get another credit card or form of payment from your customer.
• "Generic processor error: 26-Terminal flagged as Inactive in First Data database" or "GW-0080". Error code 26 indicates that FISERV has flagged your account as terminated by your merchant bank. Contact them about the status of your account.

For help resolving this and other Payflow Gateway issues, contact Payflow support.

See also:
RESULT Values and RESPMSG Text