I'm on a shared hosting environment and am setting up an app that will send fulfillment details back to Shopify.
I've gotten quite far but when I run my script I get this error:
PHP Fatal error: Uncaught Error: Class 'Shopify\Clients\Rest' not found in...
I can't figure out how/where to include this class. I tried running composer require shopify/shopify-api from SSH.
On a related note, I also use the following URL to fetch order details:
This works great, and I'm wondering if I can use this same URL method to send fulfillment details?