This update simplifies the payment process by removing a rarely used field – the Payment Identifier – from the payment form. This change improves the user experience by reducing clutter and focusing on the essential information needed to complete payments. The change was driven by a community suggestion to improve clarity.

The Payment Identifier field has been permanently hidden from the payment form view, as it does not provide actionable or useful information to the end user.

see community pr - https://github.com/odoo/odoo/pull/266072
task-6237870