How can I customize customer login with OTP on my website?

Topic summary

  • Goal: Implement a popup-based customer login using OTP (one-time password) via email on a Shopify store, instead of the standard redirect to shopify.com/auth.

  • Constraint: The original poster cannot find or edit the authentication code because Shopify handles login on its hosted auth page, limiting direct theme-level customization for custom OTP flows.

  • Latest update: A respondent recommended using a third-party app (“Fast Mobile OTP Login”) as a potential solution to enable OTP-based login within the store experience.

  • Status: No confirmation of implementation or additional technical steps provided. No guidance on bypassing Shopify’s auth redirect or exposing the auth code. Outcome remains open, with the current actionable suggestion being to try the recommended app.

Summarized with AI on December 21. AI used: gpt-5.

i am currently building a shopify website, in which i need login with email otp feature in the popup on button click, but i m not sure how to get that as shopify redirect to shopify. com /auth page and i cannot find the code from where i can implement this

Hello @iamshreevyas

Check this app

https://apps.shopify.com/fast-mobile-otp-login?