Use Zapier to import an order request from a third-party site to my Squarespace store

Hello! I'd like to know if it is possible to use Zapier to create a zap between a CRM system and my squarespace store. For example: when a client adds a tag in their CRM, I'd like that tag to trigger an order from my store. I've reviewed the developer commerce APIs, and it looks like there is code to accomplish this goal. https://developers.squarespace.com/commerce-apis/create-order But I can't get the order to trigger (I imagine there is an API key and other info specific to my store that I need to add). 

My website is currently password-protected, as I haven't finished building it yet. I'd like to know if this is possible before finishing the site. 

There is a zap between certain CRMs and Shopify that will trigger an order (I tried it and it works). I'd prefer to use Squarespace over Shopify though, so am hopeful there's a solution. Thank you in advance for your help!

Kari