[FIX] check current config payment methods to force or not the use of…

… the proxy + raise an error when its not properly configured

pos_payment_terminal/static/src/js/models.js

@@ -12,25 +12,39 @@
 odoo.define("pos_payment_terminal.models", function (require) {
     "use strict";
 
+    var core = require("web.core");
     var models = require("point_of_sale.models");
     const {PosGlobalState, Payment} = require("point_of_sale.models");
     const Registries = require("point_of_sale.Registries");
 
+    var _t = core._t;
+
     var OCAPaymentTerminal = require("pos_payment_terminal.payment");
     models.register_payment_method("oca_payment_terminal", OCAPaymentTerminal);
 
     const PosPaymentTerminalPosGlobalState = (OriginalPosGlobalState) =>
         class extends OriginalPosGlobalState {
             // @override
             async after_load_server_data() {
-                for (var payment_method_id in this.payment_methods) {
+                for (var index in this.config.payment_method_ids) {
+                    var payment_method_id = this.config.payment_method_ids[index];
                     var payment_method = this.payment_methods[payment_method_id];
                     if (
                         payment_method.use_payment_terminal === "oca_payment_terminal"
                     ) {
                         this.config.use_proxy = true;
                     }
                 }
+                if (Boolean(!this.config.proxy_ip) && this.config.use_proxy) {
+                    throw new Error(_t("Payment Terminal Error"), {
+                        cause: {
+                            message: _t(
+                                "A payment terminal has been linked to one payment provider but the IoT " +
+                                    "Box location has not been configured."
+                            ),
+                        },
+                    });
+                }
                 return await super.after_load_server_data(...arguments);
             }
         };