Attention B2B Edition Merchants and Partners: if you utilize a custom B2B Buyer Portal, custom B2B Checkout, or custom implementations via Quote APIs, action is required to avoid any service disruption.

Overview

We’re introducing an upcoming improvement to the BigCommerce B2B Quotes API, scheduled for March 2, 2026. This update is part of our ongoing efforts to improve platform reliability and ensure consistent quote behavior across B2B storefront, buyer portal, checkout, and integration experiences.

Most merchants using standard, out-of-the-box BigCommerce B2B Edition functionality will not be impacted. However, merchants with custom B2B implementations should review the details below and take action to avoid any disruption.

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

What Is Changing?

Effective March 2, 2026, we are introducing a Quote UUID requirement for select Quote APIs. This update helps ensure quote access behaves consistently across different storefront, checkout, and integration patterns.

Once enabled, affected APIs will require a uuid parameter to be included in client requests. Quote UUIDs can be fetched using the GetQuotesList query, and are returned in the API response when creating a quote.

Impacted APIs

  • REST(v2)

    GET /api/v2/rfq/{quote_id} now requires an additional uuid query parameter

  • GraphQL

    The following operations will require a uuid field in the request payload:

    • quotesCheckout

    • getQuoteInfoB2B

    • quote

Who Should Take Action?

Please review your implementation and take action if you:

  • Use a custom (self-hosted) B2B Buyer Portal on any storefront

  • Use a custom (self-hosted) B2B Checkout

  • Use a headless storefront that calls affected Quote APIs

  • Have custom implementations calling affected Quote APIs to retrieve or process quotes

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 required uuid updates.

    • Check your custom implementations using affected APIs, update API requests to include the required uuid, test and deploy your changes before March 2, 2026.

  3. Test early by opting in

    You can validate your changes before the March 2, 2026 deadline by providing the following request header attribute to the impacted REST endpoint and GraphQL mutations:

    Prefer: breaking-change=enable_uuid_q12026

    Opt-in testing will be available starting January 23, 2026.

  4. Use the technical references

    Leverage BigCommerce reference implementations to guide your updates:

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.