[MERGE] Forward-port of branch 12.0 to 13.0

content/applications/sales/point_of_sale/payment/vantiv.rst

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+=============================================
+Connect a Vantiv Payment Terminal to your PoS
+=============================================
+
+Connecting a Vantiv payment terminal allows you to offer a fluid payment
+flow to your customers and ease the work of your cashiers.
+
+.. note::
+   Please note MercuryPay only operates with US and Canadian banks, making
+   this procedure only suitable for North American businesses.
+
+Configuration
+=============
+
+Configure the Payment Method
+----------------------------
+
+First, go in the general settings of the POS app, and activate the
+Vantiv setting.
+
+.. image:: media/vantiv_01.png
+    :align: center
+
+Back in :menuselection:`Point of Sale --> Configuration --> Point of Sale`, go in the
+payments section and access your payment methods. Create a new payment
+method for Vantiv, select the payment terminal option Vantiv, and create
+new Vantiv credentials.
+
+.. image:: media/vantiv_02.png
+    :align: center
+
+To create new Vantiv credentials, fill in your merchant ID and password,
+then save. Make sure the credentials you just created are selected, then
+save the payment method.
+
+.. image:: media/vantiv_03.png
+    :align: center
+
+Pay with a Payment Terminal
+===========================
+
+In your PoS interface, at the moment of the payment, select your Vantiv
+payment method and… that’s all.
+
+.. image:: media/vantiv_04.png
+    :align: center