Error code 131042 in Meta’s conversation platform indicates a Business Eligibility payment issue. This error typically arises due to problems with your payment method or billing setup.

To resolve this issue, you should:

Check your billing setup: Ensure that all payment methods linked to your Meta Business account are up-to-date and valid. Address any payment problems: Look for any outstanding payments or issues with your current payment method and resolve them promptly.

It might be best to change the credit line because it may still be linked to another service being used by your customer that Meta has not unlinked. Probably for fraud prevention purposes, you will get this error. So, ask your client if they use this line of credit with other services connected to the Meta Developer API or Meta Business Suite. Otherwise, it seems you will not be able to unlink this line.

Also, if you have just delete the other API without removing the payment method first, sometimes it will not reflect in the Meta application because you did not detach or remove the payment method first before deleting the previous API used by your client with the other company they used to get the API working. Lastly, the client may have more than one Business Suite accounts using the same line of credit (credit or debit card number), which they may have to unlink before your company uses it for the new API they are building. This error seems like a fraud prevention measure to avoid having the same credit line linked to multiple accounts.