Questions about updating SubscriptionContracts and lines

[kyle_truong]

The SubscriptionContract contains BillingPolicy and DeliveryPolicy but the lines contain pricingPolicy. Just to test things out, I created a SubscriptionContract with the BillingPolicy interval set to 3 and DeliveryPolicy interval set to 1 (prepaid policy), then I updated the SubscriptionContract to change the BillingPolicy interval to 1 so that it would be a pay per delivery policy.

Then I took at the line data and saw this:

{
                "id": "gid://shopify/SubscriptionLine/037c21da-dc0c-4c95-897d-d118ef1c7aff",
                "quantity": 1,
                "productId": "gid://shopify/Product/6716443918493",
                "variantId": "gid://shopify/ProductVariant/39954168414365",
                "currentPrice": {
                    "amount": "408.0",
                    "currencyCode": "CAD"
                },
                ...
                "pricingPolicy": {
                    "basePrice": {
                        "amount": "170.0",
                        "currencyCode": "CAD"
                    },
                    "cycleDiscounts": [
                        {
                            "afterCycle": 0,
                            "computedPrice": {
                                "amount": "408.0",
                                "currencyCode": "CAD"
                            },
                            "adjustmentType": "PERCENTAGE",
                            "adjustmentValue": {
                                "percentage": 20
                            }
                        },
                        {
                            "afterCycle": 3,
                            "computedPrice": {
                                "amount": "459.0",
                                "currencyCode": "CAD"
                            },
                            "adjustmentType": "PERCENTAGE",
                            "adjustmentValue": {
                                "percentage": 10
                            }
                        }
                    ]
                },
                "sellingPlanId": "gid://shopify/SellingPlan/622559389",
                "sellingPlanName": "sup prepaid",
                "discountAllocations": [],
                "lineDiscountedPrice": {
                    "amount": "408.0",
                    "currencyCode": "CAD"
                }
            }

The price of 1 unit is supposed to be $170 but I'm seeing several conflicting prices within the line, specifically: 

- currentPrice
- pricingPolicy.basePrice
- pricingPolicy.cycleDiscounts[0].computedPrice
- pricingPolicy.cycleDiscounts[1].computedPrice

The output I'm seeing doesn't make sense to me when comparing to the docs, some prices are reflecting the prepaid price and some are reflecting the payperdelivery price but I figured they should all reflect payperdelivery price because I just changed the BillingPolicy and DeliveryPolicy to reflect payperdelivery. From what I currently understand, I'm supposed to update the line prices for contracts with recurring discounts as suggested in this thread:

https://community.shopify.com/c/subscription-apis/fixed-and-recurring-pricing-policies-not-working/m...

but I'm not sure what's expected in this case when I'm just switching billing/delivery policies, or any other fields of a SubscriptionContract for that matter. Also, when updating the line do I just update the currentPrice or both currentPrice and pricingPolicy.basePrice, and what about the cycleDiscounts? 

I'm really confused as to when and what exactly should I update so the pricing stays in sync for the lines and contract, hoping someone can help set me straight on these issues.

[kyle_truong · Accepted solution]

After thinking about it a bit more I think it makes sense now.

A line bought with a prepaid contract with a billing/delivery interval ratio of 3:1 will set the line's current price to x3 and the computed price to x3. That's just what happens, so if a user changes it back and forth they can change the price too. Edit: nvm, need to do more testing on this part.

I'm still not too sure about changing the line's currentPrice and/or pricingPolicy, whether changing 1 will change the other or both must be changed at the same time but I'll do more testing today.