Token scope - Read & write subscription contracts

Rate limit - Global pool (i.e. 10 requests per second per domain)

variantShopifyId - Shopify id of the variant with which the existing line is being swapped.
quantity - Quantity of the new variant which is being swapped with the existing lineItem.
pricingType - Define the pricingType for the new line added.
- OLD - The selling plan discount associated with the previous line would be applied to the new swapped line.
- NEW - The selling plan discount associated with the new line would be applied to the new swapped line.
- CUSTOM - Apply custom discount to the new swapped line.
customDiscount - Apply a custom discount to the new swapped line. Select the pricingType as CUSTOM to apply a custom discount.
sellingPlanGroupId - The sellingPlanGroupId refers to the selling plan group ID associated with the variant that will be swapped.
- If the sellingPlanGroupId is not provided, the system will assign the plan based on the priority of the available selling plan groups.
- If the provided sellingPlanGroupId is invalid or does not exist, an error will be thrown.

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