I am a retail outlet for a distributor and would like to add their API for their products to my site. I’m not sure how that is done. It would be so much easier than entering all of the products manually. Thanks
Hey there @Rajouimet 👋 and Welcome to the Seller Community
At this time Square Online is unable to integrate user-selected third-party APIs. However, you may be able to include and embed code (HTML) within a section of your Square Online site.

I hope this information is helpful! And if you care to share more details about this integration I would be able to pass it over to our product team for their visibility.
Square Community