Log into your Bigcommerce account, go to the admin panel of your online store and select Web Pages from Web Content.
Now, you can check out at View Store how the web form is published on your Bigcommerce online store web page. Form users will be able to submit the form and all form submissions will be sent to your 123FormBuilder account, in the Submissions section of your web form.
You can use 123FormBuilder to create complex order forms that can be integrated with various payment processors. This way, customers can pay your products directly on the order form you have published on your Bigcommerce store. Learn more here.