Thank you! 
Topic summary
Main issue: Whether to run Shopify Billing API in test mode or live mode during app approval.
- Guidance shared: Use live mode for app review. The Shopify QA team has internal tools to handle charges during testing.
- Immediate outcome: Original poster acknowledged the advice; no further decisions recorded.
Follow-up questions raised (unanswered):
- Can real (live) subscription billing be enabled only after submitting the app for review? If the app isn’t submitted, should billing be tested only with test: true on a development store?
- For a recurring charge set to EVERY_30_DAYS in test mode, is a full 30-day wait required to see renewal? Is there a faster way to simulate or test renewal billing?
Status: No responses yet to the follow-up questions. Discussion remains open with key testing and timing details unresolved.
Notes:
- Terms referenced include “test mode” (test: true), “live mode,” “development store,” and billing interval EVERY_30_DAYS. No attachments or code samples are central to understanding this thread.