Here are the most common reasons we have seen so far and we'll add to the list if we see any more.
The Customer will have received warnings previous to and upon expiry. Contact the customer and ask them to assign another card.
Declined_Do not honour
The card issuer does not allow subscription payments by default. The Customer needs to contact the card issuer.
There is not enough money in the account to complete the payment.
Note: If you are experiencing different declined payment statuses and they are not in the above list, please contact us at email@example.com