Calling API external to Shopify during registration - custom validation

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We are looking to add a custom validation step to the registration process.  The requirements are:

1.  Add a new field to the registration screen to capture a numeric value (external ID).  This sounds like it is trivial using Liquid.

2.  The value they entered for external ID needs to be validated to a database we store outside of Shopify

3.  If the external ID doesn't exist, the user can't register.  If the external ID does exist, we actually need to return a value to shopify that needs to be stored in the user profile.

 

What is the best way of enabling this type of functionality?

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Hi Leo,

Have you been able to figure out how to do this, I'm also looking for same solution.

 

Thanks,

Roniraj

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