I'm encountering an issue with my CarrierService app, which provides Canada Post & FedEx rates and transit times. I'm using both General and Custom shipping rates in Shopify's Shipping & Delivery settings. Here’s the challenge I’m facing:
Scenario with General Shipping Rates Only: When my cart contains only products from the General shipping rates, Shopify sends a single request to my server with an array of items:
"items": [
{
"name": "product-title",
"sku": "[-037]", <--- General shipping profile
"quantity": 1,
"grams": 16914,
"price": 74800,
"vendor": "",
"requires_shipping": true,
"taxable": true,
"fulfillment_service": "manual",
"properties": {},
"product_id": 81688840068,
"variant_id": 47479549092
},
{
"name": "product-title",
"sku": "[-104]", <--- General shipping profile
"quantity": 1,
"grams": 454,
"price": 9900,
"vendor": "",
"requires_shipping": true,
"taxable": true,
"fulfillment_service": "manual",
"properties": {},
"product_id": 8168781220,
"variant_id": 4469306484
}
]
Scenario with Custom Shipping Profiles: However, when the cart contains items from different shipping profiles (General and Custom), Shopify appears to send two separate requests in rapid succession:
16:13:11 │ remix │ "items": [
16:13:11 │ remix │ {
16:13:11 │ remix │ "name": "",
16:13:11 │ remix │ "sku": "[-104]", <--- General shipping profile
16:13:11 │ remix │ "quantity": 1,
16:13:11 │ remix │ "grams": 454,
16:13:11 │ remix │ "price": 9900,
16:13:11 │ remix │ "vendor": "vendor",
16:13:11 │ remix │ "requires_shipping": true,
16:13:11 │ remix │ "taxable": true,
16:13:11 │ remix │ "fulfillment_service": "manual",
16:13:11 │ remix │ "properties": {},
16:13:11 │ remix │ "product_id": 81687427220,
16:13:11 │ remix │ "variant_id": 446935936484
16:13:11 │ remix │ }
16:13:11 │ remix │ ],
16:13:14 │ remix │ "items": [
16:13:14 │ remix │ {
16:13:14 │ remix │ "name": "product-title",
16:13:14 │ remix │ "sku": "[-021]", <--- Custom shipping profile
16:13:14 │ remix │ "quantity": 1,
16:13:14 │ remix │ "grams": 41730,
16:13:14 │ remix │ "price": 99900,
16:13:14 │ remix │ "vendor": "vendor",
16:13:14 │ remix │ "requires_shipping": true,
16:13:14 │ remix │ "taxable": true,
16:13:14 │ remix │ "fulfillment_service": "manual",
16:13:14 │ remix │ "properties": {},
16:13:14 │ remix │ "product_id": 81687751524,
16:13:14 │ remix │ "variant_id": 446936986852
16:13:14 │ remix │ }
16:13:14 │ remix │ ],Issue:
- Sku -104 is under a general shipping profile, offering both Canada Post and FedEx rates (with our app setting the Canada Post rate as free and adding an upcharge for FedEx Ground).
- Sku -021 is under a custom shipping profile, exclusively offering FedEx Ground (set as free in our app).
In theory, when both are purchased together, FedEx Ground should be the only displayed option and be free. However, in practice, we see the FedEx Ground option but with the upcharge amount from Sku 50-4-104 (as it was calculated separately from the first request).
I created a second custom shipping profile to test this issue. Now, with three items in the cart each from different profiles I got 3 requests with the line items being sent as if it each represented a single order.
The CarrierService documentation does not clearly address this scenario, making diagnosis challenging.
Question: Should I avoid using custom shipping profiles with a CarrierService app and manage all logic server-side? Utilizing Shopify shipping profiles has significantly reduced the complexity of our server logic and improved response times to under 2 seconds.
Any insights or guidance would be greatly appreciated.
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