How Does Shopify Billing API Handle Plan Changes? (Yearly to Monthly)

Shopify Apps

Topic summary

A developer is implementing subscription-based plans using Shopify’s Billing API and needs clarification on how plan changes are handled, specifically when users switch from yearly to monthly subscriptions.

Key Questions:

  • Does Shopify automatically refund the remaining balance when switching from yearly to monthly plans?
  • Should developers manually calculate and issue refunds or credits for unused subscription time?

Documentation vs. Reality Gap:
According to Shopify’s documentation, the replacementBehavior set to “standard” (default) should defer certain subscription changes until the next billing cycle, including:

  • Annual to monthly downgrades (same currency)
  • Annual to annual downgrades of lesser value (same currency)
  • Identical plans with different discount values

However, the developer reports that in the App development test payment environment, changes apply immediately in all cases, contradicting the documented behavior.

The developer is seeking best practices for managing these subscription transitions and understanding the actual billing behavior in production environments.

Summarized with AI on November 3. AI used: claude-sonnet-4-5-20250929.
1

Hi Shopify Community,

I’m developing a Shopify app and planning to implement subscription-based plans using the Billing API. I have a question about how the Billing API handles scenarios where a user changes their subscription plan. For example, if a user purchases a yearly plan subscription and immediately switches to a monthly subscription before the yearly plan ends:

Is the remaining amount from the yearly plan automatically refunded by Shopify? If not, how should I manage such scenarios in my app? Should I calculate the remaining balance and issue a manual refund or credit? I would appreciate any insights or best practices on managing subscription changes within the Shopify Billing API.

According to the document, In replacementBehavior as standard(default),

Cancels the merchant’s current app subscription immediately and replaces it with the newly created app subscription, with the exception of the following scenarios where replacing the current app subscription will be deferred until the start of the next billing cycle.

  • The current app subscription is annual and the newly created app subscription is annual, using the same currency, but is of a lesser value.
  • The current app subscription is annual and the newly created app subscription is monthly and using the same currency.
  • The current app subscription and the newly created app subscription are identical except for the discount value.

But in the App development test payment, it applies immediately, in any of the cases.

Thank you!

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