Ory Account Experience (hosted UI) registration trait setup via creation of registration flow

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Ory Network Project

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Describe your problem

Issue: Unable to send Identity Traits values when creating a registration flow

I am using Ory’s Account Experience ( hosted UI )
I have newsletter optin: bool ( default to true) in my Identity schema
Upon registration flow creation, I want to check from CloudFlare Header is country is IN LIST, and IF YES, then I want the newsletter optin: false
I tried sending this data with the registration flow in creation ,but none of the solution below worked.

/self-service/registration/browser?newsletter=false
/self-service/registration/browser?traits.newsletter=false
/self-service/registration/browser?prefill.newsletter=no
/self-service/registration/browser?traits={newsletter:false}

Describe your ideal solution

Ideal Solution

Just the way we can send return_to param via user registration flow creation query, we should be possible to send some default/desired trait values. Ideally ability for our app to send certain data during the flow generation via url that currently we handle via API.

This applies to all flows

• registration
• login
• etc....

This is what currently works
/self-service/registration/browser?return_to="xyz.com/x/y

This is what would be REALLY nice to have
/self-service/registration/browser?return_to="xyz.com/x/y&traits.newsletter=true&trait.x.y="abcd

Workarounds or alternatives

Currently only work around is to change the feature's flow

We let user register simply with newsletter = false
Upon registration when user is redirected to the app's domain, this is when we trigger a dialog box and let user make some trait selections

Upon trait selection submission, we make Ory API call to update those selections

Version

Latest Stable

Additional Context

Start by reviewing how /self-service/registration/browser handles flow-creation query parameters, especially the existing return_to parameter and the attempted traits and prefill forms. Done means a supported way to provide default trait values during registration flow creation, with the behavior applying to the requested flows and preserving existing return_to handling.