Hi there, can you please provide URL of your website?
I have recently integrated shipping and quote API in client's website, so I know what you are looking for. I have great expertise when it comes to integrating APIs and Plugins development. I'm an expert full-stack developer with more than 14+ years of IT industry experience and have a team of professionals with years of experience working on various frameworks, CMS, PHP, MySQL, Angular, React, Javascript, Google Maps API, Custom API development, eCommerce solutions, Multi-vendor marketplaces, ERP, etc.
Let us connect over a quick chat to discuss further.
Regards,
Asad