[FIX] payment,sale_payment: extract code to overridable methods

- We extract some code logic to methods to allow to override them.
  This is needed for the subscription module where a payment token need
  to be copied from a transaction to a subscription.
  The subscriptions is created from a sale order and before the
  payment.transaction holding the payment.token id is validated.
  Since the payment.transaction is not validated, the subscription
  module doesn't find the correct transaction.

  By extracting this code logic, we can override exactly when it should
  be.

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