diff --git a/addons/laundry_management/models/account_payment_ext.py b/addons/laundry_management/models/account_payment_ext.py
new file mode 100644
index 0000000..25ade3d
--- /dev/null
+++ b/addons/laundry_management/models/account_payment_ext.py
@@ -0,0 +1,22 @@
+from odoo import models, fields
+
+
+class AccountPaymentLaundryExt(models.Model):
+    """Informational stamp — links settlement payments to the POS session
+    that was open when the cashier collected the money.
+
+    This field is purely for visibility (closing-screen summary). It does
+    NOT inject settlement totals into POS cash-control math.
+    """
+    _inherit = 'account.payment'
+
+    pos_session_id = fields.Many2one(
+        'pos.session', string='POS Session',
+        readonly=True, copy=False, index=True,
+        help='POS session that was open when this settlement was created.',
+    )
+    settlement_pos_pm_id = fields.Many2one(
+        'pos.payment.method', string='Settlement Payment Method',
+        readonly=True, copy=False, index=True,
+        help='Original POS payment method chosen by the cashier during settlement.',
+    )