Originally Posted by Dr Jabadski

Congratulations. Some business credit card accounts have multiple account numbers, sometimes 1 more than the number of cards issued. Each overall account will have 1 number that is the billing and payment account number, then (at least) 1 number for each credit card.

With some BOA biz credit card accounts, the annual fee is $50 or $35 for the overall account plus $35 or $50 for each card issued.

The issuers sorts it all out internally. During the month you might see the card number accumulating a balance while the billing/payment account number balance remains unchanged until statement date.

IME, sending ACH bill-pay payment to either of the 2 BOA biz account numbers results in the payment being properly credited. Ideally the number on the card itself should be used for all "charge" purposes and payment should be sent to the other number (which is printed on the payment stub of the monthly statement).