Problem Description:

Customers are experiencing recurring payment failures when attempting to process product subscriptions. The issue is split into two primary error states:

Missing Payment Method: The system flags off-session renewals as having no payment method assigned (no Payment Method (pm_)).

Legacy Card Source Error: Automated retry attempts trigger an error stating the card is not supported (billed to a legacy card source... cannot be charged off-session).

Expected Behavior:

Subscriptions should process automatically using valid on-file payment methods. Legacy card sources should migrate smoothly or prompt a user update rather than silently failing or throwing misleading errors during off-session renewals.

Replication: N/A .

Checked Settings: Subscription Section > Customers (7 subscriptions cancelled as a result).

Checked Shop logs and found these two errors.

Subscription payment failed for [Product] — Subscription #11 has no Payment Method (pm_) for off-session renewal.

Subscription payment failed for [Product] — Subscription #11 is billed to a legacy card source (card_...) that cannot be charged off-session; the customer must re-add their card.