Add Product to Existing Subscription

[PaulVomberg]

Is it possible to add a product to an existing subscription? If so, what's the API call to make that happen? 

[Brian_S · Accepted solution]

Yes - you can add lines to a SubscriptionContract:

1. First you'll get a SubscriptionDraft Id via subscriptionContractUpdate: https://shopify.dev/api/admin-graphql/2021-10/mutations/subscriptioncontractupdate
2. Then you add a line via subscriptionDraftLineAdd: https://shopify.dev/api/admin-graphql/2021-10/mutations/subscriptionDraftLineAdd
3. Then you commit your draft via subscriptionDraftCommit: https://shopify.dev/api/admin-graphql/2021-10/mutations/subscriptionDraftCommit

Check out this tutorial: https://shopify.dev/apps/subscriptions/contracts#add-a-line-to-the-subscription-draft

[PaulVomberg]

That's great - thank you so much Brian!