Shopify Plus & Auth0: Bridging the Locale Gap in Customer Accounts OIDC Connector

As Shopify migration experts at Shopping Cart Mover, we're constantly delving into the intricacies of the platform, especially for our Shopify Plus clients. A recent discussion in the Shopify Community forums highlighted a critical challenge for global merchants: the seamless localization of the customer login experience when using external identity providers like Auth0 via Shopify's new Customer Accounts OIDC Connector.

Our fellow merchant, jwkdp, brought to light an issue that resonates deeply with anyone managing an international Shopify store: the absence of locale information being passed to Auth0 during the login redirect. For businesses serving a global audience, ensuring every touchpoint, especially the crucial login process, is in the customer's preferred language isn't just a nicety—it's a necessity for building trust, reducing friction, and fostering a truly global brand experience.

The Core Problem: A Disconnect in Localization

The essence of the problem, as confirmed by Shopify Plus support, is straightforward yet impactful: when a customer initiates a login through Shopify and is then redirected to an external OpenID Connect (OIDC) provider like Auth0, Shopify does not include the shopper's language preference in that handoff. This means that if your storefront is meticulously localized in French, German, or Spanish, the subsequent login screen presented by Auth0 will default to its configured language (often English), creating a jarring and inconsistent experience for your international customers.

Shopify's support team explicitly stated: "Currently, this isn’t supported. When a customer signs in, Shopify redirects them to your Auth0 login screen, but does not pass the shopper’s language preference as part of that handoff." While Shopify's own built-in login screens adeptly reflect the shopper’s language, this functionality does not yet extend to third-party OIDC providers integrated through the Customer Accounts OIDC Connector.

Why ui_locales Matters for OIDC Integrations

For those unfamiliar with the technical specifics, OIDC is a simple identity layer on top of the OAuth 2.0 protocol, allowing clients to verify the identity of the end-user based on the authentication performed by an authorization server, as well as to obtain basic profile information about the end-user. A key part of providing a localized experience in OIDC is the ui_locales authorization parameter.

As jwkdp elaborated, Auth0 Universal Login (especially the New Universal Login) fully supports the standard OIDC ui_locales parameter. When an authorization request includes ui_locales=fr-CA (or simply fr), Auth0 can automatically render its login and signup experiences in that specified language. However, after reviewing numerous authentication logs, it became evident that Shopify's OIDC connector simply isn't forwarding this critical piece of information.

Shopify's Stance and the Call for Advocacy

The good news is that Shopify's support team has acknowledged this limitation and noted it as a feature request. This indicates that they are aware of the need and are open to addressing it based on merchant feedback. They've even provided a direct link to the feature request on the Shopify.dev community forum:

• Pass UI locales to external OIDC identity provider in new customer accounts

For any Shopify Plus merchant leveraging external identity providers for customer accounts, it's crucial to visit this link, add your vote, and provide detailed business context. Your input directly influences Shopify's development roadmap and helps prioritize features that matter most to the merchant community.

Navigating the Current Landscape: Auth0-Side Workarounds

While we await a native solution from Shopify, the support team did offer potential workarounds that can be implemented on the Auth0 side. These are not perfect substitutes for Shopify passing the explicit storefront locale, but they can significantly improve the international login experience:

1. Browser Language Detection: Auth0 can be configured to detect the shopper’s browser language and render the Universal Login screen accordingly. This is often a robust fallback, as a user's browser language typically aligns with their preferred language. However, it might not always match the specific market or language selected on your Shopify storefront.

2. Setting a Default Language: You can configure a default language within your Auth0 Universal Login settings. While less ideal for truly multi-market stores, it ensures that at least a consistent, known language is presented, rather than Auth0's global default, which might be unexpected for some users.

For detailed instructions on implementing these Auth0-side solutions, we recommend reviewing their documentation:

• Universal Login Internationalization - Auth0 Docs

It's important to understand the limitations of these workarounds: they rely on the browser's settings or a global default, rather than the precise language chosen by the customer on your Shopify storefront. This means the login experience might still not perfectly align with the storefront's selected locale, but it's a step towards better localization.

The Business Impact: Why a Seamless Experience is Non-Negotiable

For global brands, every element of the customer journey contributes to overall brand perception and conversion rates. A disjointed login experience can lead to:

• Reduced Trust: Customers may feel less confident in a brand that can't maintain language consistency.
• Increased Friction: A sudden language change can confuse users, potentially leading to abandoned login attempts or unnecessary customer support inquiries.
• Negative Brand Perception: It signals a lack of attention to detail for international customers, undermining efforts to create a truly global and inclusive brand.
• Impact on Conversion: A frustrating login process can directly impact customer retention and subsequent purchases.

Our Perspective at Shopping Cart Mover

At Shopping Cart Mover, we specialize in navigating complex Shopify integrations and migrations, ensuring that every aspect of your e-commerce platform functions seamlessly. This locale issue highlights the ongoing need for robust development and integration strategies, especially for Shopify Plus merchants operating in diverse markets.

While the current limitation exists, understanding the available workarounds and actively advocating for platform improvements are key. We encourage all affected merchants to engage with the Shopify.dev feature request and to consider how Auth0's built-in localization features can mitigate the impact in the interim.

Conclusion

The challenge of passing locale information from Shopify's Customer Accounts OIDC Connector to external identity providers like Auth0 is a significant one for global Shopify Plus merchants. While Shopify has acknowledged the need and provided workarounds, a native solution that seamlessly passes the storefront's chosen language remains a critical feature request.

By leveraging Auth0's internationalization capabilities and actively participating in the Shopify developer community, merchants can work towards a more consistent and localized customer login experience. As always, for complex integrations and ensuring your Shopify store is optimized for global success, don't hesitate to reach out to experts who can help you navigate these intricate development challenges.