Pay Invoice errors
Posted invoices where the payment could not be registered.
Open Pay Invoice Error
The link opens the screen directly in the Integration Dashboard.
The number one cause: no journal set
If an order arrives with a payment method you have not assigned a journal to, the payment step fails. See Payment journals in the configuration section.
Other causes
The invoice is not posted — you cannot pay a draft.
The journal has no bank or cash account configured.
An amount that does not match the invoice balance.
Carriers and payment methods
Remember that payment journals are set per shipping company (for COD) and per online payment method. A new payment method in your store means a new journal to assign.
Retry once the cause is fixed
Fix the cause first, in Odoo or in your settings, then press Retry on the row. Retrying without fixing the cause fails with the same message.