diff --git a/src/api/cart.js b/src/api/cart.js
index 9c2d631..d0b18a9 100644
--- a/src/api/cart.js
+++ b/src/api/cart.js
@@ -259,6 +259,16 @@ export default class extends Base {
         this.remoteRequest('/cart/update', 'POST', { params: payload }, callback);
     }
 
+    /**
+     * POST form data to /cart.php
+     *
+     * @param {FormData} formData
+     * @param {Function} callback
+     */
+    postFormData(formData, callback) {
+        this.makeRequest('/cart.php', 'POST', { formData }, false, callback);
+    }
+
     /**
      * Get cart content
      *