With ShippyPro's GetCarriersOptions API call you'll be able to apply all your additional Carrier services available for your shipment before creating the label with the Shipping API call.
You can find an example below:
"CarrierOptions": [{
"name": "upshazardousmaterials",
"value": 1
}]
Discover more about our GetCarriersOptions API call in our API Documentation!
Easy, isn't it? ✨