diff --git a/sale_payment_deposit/models/__init__.py b/sale_payment_deposit/models/__init__.py
index 13088db7..c3152eb5 100644
--- a/sale_payment_deposit/models/__init__.py
+++ b/sale_payment_deposit/models/__init__.py
@@ -1,3 +1,4 @@
 from . import account
+from . import payment
 from . import sale
 from . import sale_patch
diff --git a/sale_payment_deposit/models/payment.py b/sale_payment_deposit/models/payment.py
new file mode 100644
index 00000000..f19bf7f1
--- /dev/null
+++ b/sale_payment_deposit/models/payment.py
@@ -0,0 +1,33 @@
+from odoo import models, _
+
+import logging
+_logger = logging.getLogger(__name__)
+
+
+class PaymentTransaction(models.Model):
+    _inherit = 'payment.transaction'
+
+    # Override to confirm payments totaling the amount_total_deposit
+    def _check_amount_and_confirm_order(self):
+        self.ensure_one()
+        for order in self.sale_order_ids.filtered(lambda so: so.state in ('draft', 'sent')):
+            # default amount as originally calculated
+            amount = order.amount_total
+            if order.amount_total_deposit:
+                amount = order.amount_total_deposit
+            if order.currency_id.compare_amounts(self.amount, amount) == 0:
+                order.with_context(send_email=True).action_confirm()
+            else:
+                _logger.warning(
+                    '<%s> transaction AMOUNT MISMATCH for order %s (ID %s): expected %r, got %r',
+                    self.acquirer_id.provider,order.name, order.id,
+                    amount, self.amount,
+                )
+                order.message_post(
+                    subject=_("Amount Mismatch (%s)") % self.acquirer_id.provider,
+                    body=_("The order was not confirmed despite response from the acquirer (%s): order total is %r but acquirer replied with %r.") % (
+                        self.acquirer_id.provider,
+                        amount,
+                        self.amount,
+                    )
+                )
diff --git a/sale_payment_deposit/models/sale.py b/sale_payment_deposit/models/sale.py
index a7b44b32..b7a0ec6e 100644
--- a/sale_payment_deposit/models/sale.py
+++ b/sale_payment_deposit/models/sale.py
@@ -7,7 +7,7 @@ class SaleOrder(models.Model):
 
     amount_total_deposit = fields.Monetary(string='Deposit', compute='_amount_total_deposit')
 
-    @api.depends('amount_total', 'payment_term_id.deposit_percentage')
+    @api.depends('amount_total', 'payment_term_id.deposit_percentage', 'payment_term_id.deposit_flat')
     def _amount_total_deposit(self):
         for order in self:
             percent_deposit = order.amount_total * float(order.payment_term_id.deposit_percentage) / 100.0