Add line

post

https://api.loopsubscriptions.com/storefront/2023-10/subscription/{subscriptionId}/line

This endpoint allows you to permanently adds a product to a subscription, ensuring it recurs in all future orders until removed.

sellingPlanGroupId - The sellingPlanGroupId refers to the selling plan group ID associated with the variant that will be added.
- 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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