This update removes a redundant feature related to payment processing through payment terminals. The removal of fast payments using these terminals made a previous override unnecessary, streamlining the system. This change improves efficiency and reduces potential complexity.

We removed fast payments using payment terminals, making the
`fastPayments` method override useless.

see odoo/odoo#270240
task-6303855

Forward-Port-Of: odoo/enterprise#120766
Forward-Port-Of: odoo/enterprise#120672