Attention B2B Edition Merchants and Partners: if you utilize a custom B2B Buyer Portal, custom B2B Checkout, or custom implementations via Quote APIs and Company Creation APIs, the enforcement deadline is May 3, 2026. No further extensions will be granted. Action is required to avoid any service disruption.

All dates and times referenced in this article are in U.S. Central Time (CT), unless otherwise noted.

Overview

This is the final reminder regarding the mandatory API updates we previously communicated across multiple notices. Implementations that have not been updated will experience service disruption.

What Is Changing?

Starting May 3, 2026, the following mandatory field requirements will be enforced:

• Quote APIs: Must now include a uuid field

• Company Creation APIs: Must now include a customerEmail field.

Impacted APIs

• REST(v2):

  • GET /api/v2/rfq/{quote_id}

  • POST /api/v2/frontend/companies

• GraphQL Mutations:

  • quotesCheckout

  • getQuoteInfoB2B

  • quote

  • companyCreate

Who Should Take Action?

Please review your implementation and take action if you use:

• Custom (self-hosted) B2B Buyer Portal on any storefront

• Custom (self-hosted) B2B Checkout

• Headless storefronts or Custom implementations calling affected APIs for quote processing or company account creation.

What Do I Need to Do?

1. Review your implementation

   If you use a self-hosted Buyer Portal, Checkout, headless storefront, or any custom quote integration, review your codebase immediately.

2. Update your code

   • Upgrade your Custom B2B Buyer Portal orCustom B2B Checkout to the latest version to automatically receive the updates.

   • Check your custom implementations using affected APIs, update API requests to include the mandatory uuid and customerEmail fields.

   All changes must be deployed before the May 3, 2026 deadline.

3. Validate your changes

   You can validate your changes ahead of the deadline by using the following Prefer header attributes in your API requests:

   • Quote APIs 

     Prefer: breaking-change=enable_uuid_q12026

   • Company Creation APIs

     Prefer: breaking-change=enable_customer_email_validation

4. Use the technical references

   Leverage BigCommerce reference implementations to guide your updates.

   Quote APIs

   Mandatory Action: A uuid is now required for the following operations to retrieve or process quote data.

   • REST(v2) GET /api/v2/rfq/{quote_id} 

     • Buyer Portal Reference Example

     • B2B Checkout Reference Example

   • GraphQL getQuoteInfoB2B, quote, quotesCheckout operations

     • Reference Example #1

     • Reference Example #2

   Company Creation APIs

   Mandatory Action: A customerEmail is now required for the following operations to create company accounts.

   • REST(v2) POST /api/v2/frontend/companies

   • GraphQL companyCreate operation

     • Buyer Portal reference example

Support & Next Steps

If you’re unsure whether your store is affected or would like help reviewing your setup, please reach out to BigCommerce Support or your Customer Success Manager.