Hi,

The payment creation process begins in the 'action_create_payments' method of account.payment.register, which calls the '_create_payments' method. Within _create_payments:

1) Payments are created in the _init_payments method by initializing account.payment records with the required values.

2) These payments are then posted through the '_post_payments' method, which calls the 'action_post()' method on the account.payment records. This triggers the self.move_id._post() method in account.payment, generating and posting the corresponding account.move (journal entry) into the general ledger.

3) Finally, the payments are reconciled through the _reconcile_payments method, ensuring proper linkage between payments and their associated invoices or bills.

Hope it helps