[ADD] pos_qfpay: Add QFPay payment terminal

closes odoo/documentation#14191

Related: odoo/odoo#220059
Related: odoo/enterprise#93585
Signed-off-by: fja-odoo <fja@odoo.com>

content/applications/sales/point_of_sale/payment_methods/terminals.rst

@@ -26,6 +26,7 @@ To activate a payment terminal and allow processing payments with it, follow the
    - :doc:`Adyen <terminals/adyen>`
    - :doc:`Ingenico <terminals/ingenico>`
    - :doc:`Mercado Pago <terminals/mercado_pago>`
+   - :doc:`QFPay configuration <terminals/qfpay>`
    - :doc:`Razorpay <terminals/razorpay>`
    - :doc:`SIX <terminals/six>`
    - :doc:`Stripe <terminals/stripe>`
@@ -57,6 +58,7 @@ Once the transaction is successful, the payment is automatically validated in Po
    terminals/adyen
    terminals/ingenico
    terminals/mercado_pago
+   terminals/qfpay
    terminals/razorpay
    terminals/six
    terminals/stripe

content/applications/sales/point_of_sale/payment_methods/terminals/qfpay.rst

@@ -0,0 +1,67 @@
+=====
+QFPay
+=====
+
+QFPay is a payment service that offers payment solutions through the `HaoJin App
+<https://qfpay.global/products/merchant-app/>`_ for customer transactions with a physical terminal.
+
+.. important::
+   - QFPay payment terminals do not require an :doc:`IoT Box </applications/general/iot>` to
+     operate.
+   - QFPay terminals are exclusively for Hong Kong.
+
+.. _pos/qfpay/configuration:
+
+QFPay configuration
+===================
+
+To configure a QFPay payment terminal, follow these steps:
+
+#. Create a QFPay account on the `QFPay website <https://qfpay.global/products/qfpay-pos-api/>`_.
+#. Request activation of `Asynchronous Notifications
+   <https://sdk.qfapi.com/docs/common-api/asynchronous-notification/>`_ from the application email.
+#. Provide the Odoo server address on the QFPay portal, followed by `/qfpay/notify`, and copy the
+   notification key provided by QFPay.
+#. Set up the QFPay terminal by connecting the HaoJin App to the QFPay account as instructed by
+   QFPay, then copy the terminal's IP address.
+#. Request a self-signed certificate from QFPay linked to the terminal's IP address, and import it
+   into the relevant POS in Odoo.
+#. Generate a :guilabel:`POS-KEY` from the HaoJin App: go to :menuselection:`Haojin App --> My -->
+   Settings --> Pos Call Up Key --> Reset Key`. Then, copy the generated :guilabel:`POS-KEY`.
+
+.. note::
+   - The **Asynchronous Notifications** are automated messages confirming successful payments or
+     refunds by QFPay.
+   - Write the server address as follows: `https://yourdomain.odoo.com/qfpay/notify`.
+   - If the terminal's IP address changes, update it in the :ref:`Odoo POS settings
+     <configuration/settings>` and request a new self-signed certificate from QFPay.
+   - If a QFPay account already exists, contact `technical.support@qfpay.com` with the merchant
+     information and server address.
+
+.. tip::
+   Alternatively, retrieve the POS-KEY from the `MMS (Merchant Management System) portal
+   <https://merchant.qfpay.global/>`_: go to :menuselection:`MMS portal --> Settings --> Device
+   Settings`.
+
+.. _pos/qfpay/odoo-configuration:
+
+Odoo POS configuration
+======================
+
+To connect the QFPay terminal with Odoo Point of Sale, follow these steps:
+
+#. Go to :menuselection:`Point of Sale --> Configuration --> Settings`, scroll down to the
+   :guilabel:`Payment Terminals` section, enable the :guilabel:`QFPay` terminal, and click
+   :guilabel:`Save`.
+#. Go to :menuselection:`Point of Sale --> Configuration --> Payment Methods` and :doc:`create a
+   payment method <../../payment_methods>`.
+#. Set the :guilabel:`Journal` field to :guilabel:`Bank`.
+#. Select the desired point of sale in the :guilabel:`Point of Sale` field.
+#. Set the :guilabel:`Integration` field to :guilabel:`Terminal`.
+#. Set the :guilabel:`Integrate with` field to :guilabel:`QFPay`.
+#. Paste the copied information from :ref:`QFPay <pos/qfpay/configuration>` into the corresponding
+   fields:
+
+   - :guilabel:`Terminal IP`
+   - :guilabel:`POS Key`
+   - :guilabel:`Notification Key`