A quick brief in response to your description, I can integrate payment gateway on you website in shopify. Please discuss more on this.
Also I can develop a perfect functional multi industry CMS wordpress, shopify, magento, Woocommerce Plugin, joomla theme. I would do the design and coding for your website as I am PHP, HTML, C, C++, Bootstrap, Java script, jquery, Angular, react, node. Js, android app, ios app and canvas specialist. Within this workflow I will concentrate on the usability of the site, coding and Integration. The design would need a few days. The coding more than a week.
I would be pleased to provide additional information and discuss application to specific requirement. I always prefer to offer quality and modern styles.
Thanks in Advance!