diff --git a/docsource/modules180-190.rst b/docsource/modules180-190.rst
index 75cff9999460..ee0decd86626 100644
--- a/docsource/modules180-190.rst
+++ b/docsource/modules180-190.rst
@@ -812,7 +812,7 @@ Module coverage 18.0 -> 19.0
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | |del| payment_razorpay_oauth                      |                      |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
-| |new| payment_redsys                              |                      |                                                 |
+| |new| payment_redsys                              |Done                  |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | payment_stripe                                    |Nothing to do         |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
diff --git a/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/post-migration.py b/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/post-migration.py
new file mode 100644
index 000000000000..1d704d2ed785
--- /dev/null
+++ b/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/post-migration.py
@@ -0,0 +1,37 @@
+# Copyright 2026 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from openupgradelib import openupgrade
+
+from odoo import Command
+
+PAY_METHOD_MAPPING = {
+    "T": "payment.payment_method_card",
+    "z": "	payment.payment_method_bizum",
+}
+
+
+def _adjust_payment_methods(env):
+    """On the OCA module, done before the payment refactoring, the payment method of
+    Redsys was defined through a specific field, instead of using payment_method_ids
+    field.
+
+    We need to convert existing payment providers to this new way, as the Odoo module
+    handles it through it.
+    """
+    if not openupgrade.column_exists(env.cr, "payment_provider", "redsys_pay_method"):
+        return  # No previous OCA module installed
+    env.cr.execute(
+        "SELECT id, redsys_pay_method FROM payment_provider "
+        "WHERE code='redsys' AND redsys_pay_method IS NOT NULL"
+    )
+    for provider_id, redsys_pay_method in env.cr.fetchall():
+        provider = env["payment.provider"].browse(provider_id)
+        provider.payment_method_ids = [
+            Command.set(env.ref(PAY_METHOD_MAPPING[redsys_pay_method]).ids)
+        ]
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    _adjust_payment_methods(env)
diff --git a/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/pre-migration.py b/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/pre-migration.py
new file mode 100644
index 000000000000..0fbb1682f16d
--- /dev/null
+++ b/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/pre-migration.py
@@ -0,0 +1,27 @@
+# Copyright 2026 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    openupgrade.rename_fields(
+        env,
+        (
+            "payment.provider",
+            "payment_provider",
+            "redsys_terminal",
+            "redsys_merchant_terminal",
+        ),
+    )
+    openupgrade.rename_xmlids(
+        env.cr,
+        [
+            (
+                "payment_redsys.provider_form_redsys",
+                "payment_redsys.payment_provider_form",
+            ),
+            ("payment_redsys.redsys_form", "payment_redsys.redirect_form"),
+        ],
+    )
diff --git a/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/upgrade_analysis_work.txt b/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/upgrade_analysis_work.txt
new file mode 100644
index 000000000000..9db457d82edb
--- /dev/null
+++ b/openupgrade_scripts/scripts/payment_redsys/19.0.1.0/upgrade_analysis_work.txt
@@ -0,0 +1,16 @@
+---Models in module 'payment_redsys'---
+---Fields in module 'payment_redsys'---
+payment_redsys / payment.provider         / code (False)                  : NEW selection_keys: ['adyen', 'aps', 'asiapay', 'authorize', 'buckaroo', 'custom', 'demo', 'dpo', 'ecpay', 'flutterwave', 'iyzico', 'mercado_pago', 'mollie', 'none', 'nuvei', 'paymob', 'paypal', 'payu', 'razorpay', 'redsys'], mode: modify
+# NOTHING TO DO: the value is the same for the OCA and this one
+
+payment_redsys / payment.provider         / redsys_merchant_code (char)   : NEW
+payment_redsys / payment.provider         / redsys_secret_key (char)      : NEW
+# NOTHING TO DO: Same field name
+
+payment_redsys / payment.provider         / redsys_merchant_terminal (char): NEW
+# DONE: pre-migration: Rename field
+
+---XML records in module 'payment_redsys'---
+NEW ir.ui.view: payment_redsys.payment_provider_form
+NEW ir.ui.view: payment_redsys.redirect_form
+# DONE: pre-migration: Rename OCA XML-IDs