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diff --git a/addons/point_of_sale/static/src/js/payment.js b/addons/point_of_sale/static/src/js/payment.js
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+odoo.define('point_of_sale.PaymentInterface', function (require) {
+"use strict";
+
+var core = require('web.core');
+
+/**
+ * Implement this interface to support a new payment method in the POS:
+ *
+ * var PaymentInterface = require('point_of_sale.PaymentInterface');
+ * var MyPayment = PaymentInterface.extend({
+ *     ...
+ * })
+ *
+ * To connect the interface to the right payment methods register it:
+ *
+ * var models = require('point_of_sale.models');
+ * models.register_payment_method('my_payment', MyPayment);
+ *
+ * my_payment is the technical name of the added selection in
+ * use_payment_terminal.
+ *
+ * If necessary new fields can be loaded on any model:
+ *
+ * models.load_fields('pos.payment.method', ['new_field1', 'new_field2']);
+ */
+var PaymentInterface = core.Class.extend({
+    init: function (pos, payment_method) {
+        this.pos = pos;
+        this.payment_method = payment_method;
+        this.supports_reversals = false;
+    },
+
+    /**
+     * Call this function to enable UI elements that allow a user to
+     * reverse a payment. This requires that you implement
+     * send_payment_reversal.
+     */
+    enable_reversals: function () {
+        this.supports_reversals = true;
+    },
+
+    /**
+     * Called when a user clicks the "Send" button in the
+     * interface. This should initiate a payment request and return a
+     * Promise that resolves when the final status of the payment line
+     * is set with set_payment_status.
+     *
+     * For successful transactions set_receipt_info() should be used
+     * to set info that should to be printed on the receipt. You
+     * should also set card_type and transaction_id on the line for
+     * successful transactions.
+     *
+     * @param {string} cid - The id of the paymentline
+     * @returns {Promise} resolved with a boolean that is false when
+     * the payment should be retried. Rejected when the status of the
+     * paymentline will be manually updated.
+     */
+    send_payment_request: function (cid) {},
+
+    /**
+     * Called when a user removes a payment line that's still waiting
+     * on send_payment_request to complete. Should execute some
+     * request to ensure the current payment request is
+     * cancelled. This is not to refund payments, only to cancel
+     * them. The payment line being cancelled will be deleted
+     * automatically after the returned promise resolves.
+     *
+     * @param {} order - The order of the paymentline
+     * @param {string} cid - The id of the paymentline
+     * @returns {Promise}
+     */
+    send_payment_cancel: function (order, cid) {},
+
+    /**
+     * This is an optional method. When implementing this make sure to
+     * call enable_reversals() in the constructor of your
+     * interface. This should reverse a previous payment with status
+     * 'done'. The paymentline will be removed based on returned
+     * Promise.
+     *
+     * @param {string} cid - The id of the paymentline
+     * @returns {Promise} returns true if the reversal was successful.
+     */
+    send_payment_reversal: function (cid) {},
+
+    /**
+     * Called when the payment screen in the POS is closed (by
+     * e.g. clicking the "Back" button). Could be used to cancel in
+     * progress payments.
+     */
+    close: function () {},
+});
+
+return PaymentInterface;
+});