- Added paymentInstrumentSendAddEmail mutation (API version 2026-10) to email customers a link for adding a payment method to a subscription, order, or draft order.
- Requires the write_customers access scope and returns the target Customer plus any userErrors; optional email arguments let you customize sender and BCC.
- Additive change – existing integrations are unaffected; apps must upgrade to the new API version and scope to use the feature.