I need to add a field to specific product types that the admins can drop in an ID to a product on a different platform.
Then, later, when a user purchases that product, send that ID to Zapier.
I've been looking through the custom fields and added some but they dont' show up on the CMS?? Help is welcomed as it's a fast project.
sorry for this issue
also its not possible to add custom field on Shopify product admin but you can try product page custom fields see this link
I'd recommend checking out the Custom Fields app. The app comes with a Chrome browser extension that makes it possible for admins to enter product metafield data within the Shopify interface. It also seamlessly integrates with most themes and you can display the field on your PDP in just a few clicks.
For the second requirement, you can install Arigato Automation, this will help to listen to order created events and send the metafield data to Zapier automatically.
Please reach out to our team here and we'll be happy to give you a hand with this.