diff --git a/addons/payment/static/src/js/payment_form_mixin.js b/addons/payment/static/src/js/payment_form_mixin.js
index d2ff5f1c66e..55176781dc7 100644
--- a/addons/payment/static/src/js/payment_form_mixin.js
+++ b/addons/payment/static/src/js/payment_form_mixin.js
@@ -31,6 +31,8 @@
          * @override
          */
         start: async function () {
+            this.txContext = {}; // Synchronously initialize txContext before any await.
+            Object.assign(this.txContext, this.$el.data());
             await this._super(...arguments);
             window.addEventListener('pageshow', function (event) {
                 if (event.persisted) {
@@ -38,8 +40,6 @@
                 }
             });
             this.$('[data-bs-toggle="tooltip"]').tooltip();
-            this.txContext = {};
-            Object.assign(this.txContext, this.$el.data());
             const $checkedRadios = this.$('input[name="o_payment_radio"]:checked');
             if ($checkedRadios.length === 1) {
                 const checkedRadio = $checkedRadios[0];