This commit adds support of payment in the account customer portal. This
is done in the account_payment module. This way customers can now pay
invoices directly on the customer portal and have access to the status
of their invoices. It replaces the old website payment mechanism that
was only allowing to pay without generating payments and reconciliating
them.
Two routes are defined in this commit, one for form-based payments and
one for server2server-based payment. Please refer to commit 1fdb10f0ac
for more details about the new payment form.
Tools methods are added to handle transaction / invoice matching, the
check of invoice and the automatic payment and reconciliation.
Purpose of this commit is to add a link between invoices and transactions
to store payment data like what is already done for sale orders.
* add payment_tx_id on account.invoice model that stores the last
transaction; also add the acquirer related on the tx;
* add a stat button on invoice with links to all transactions linked
to that invoice;
* add account_invoice_id on payment.transaction model that stores the
link to the invoice;
* add the inverse one2many from invoice to all its transactions so
that we can browse them if necessary;
Christophe Simonis