Starting with API version 2026-04, Shopify has expanded the tax_summaries/create webhook for Tax Partner Apps to include merchant business entity information. The webhook payload now features a new merchant_business_entity field at the root level, which provides the global ID and legal entity details responsible for transactions. This enhancement enables Tax Partner Apps to accurately map business entities across multiple shops and stores.
For developers building tax solutions on Shopify, this update significantly improves tax calculation accuracy and multi-entity management. By receiving business entity information directly in the webhook payload, you can now properly attribute transactions to the correct legal entity without making additional API calls, reducing complexity and improving performance. This is especially valuable for merchants operating multiple shops or entities, as it eliminates the guesswork in cross-shop entity mapping.
Managing OAuth tokens and API authentication across multiple shops is streamlined with GetShopifyToken. Our platform ensures your tax integration maintains secure access to each merchant's business entity data, making it easier to implement this new webhook functionality across your customer base.