To add

metadata_public

when submitting a registration flow in Ory Kratos, you need to include it in the payload of your registration request. Here's how you can do it: 1. When submitting the registration flow, add a

metadata_public

field to your request payload alongside the other required fields like traits and password. 2. The

metadata_public

should be an object containing the public metadata you want to associate with the identity. Here's an example of how your registration payload might look:

json {   "method": "password",   "csrf_token": "your-csrf-token",   "traits": {     "email": "<mailto:user@example.com|user@example.com>",     "tos": true   },   "password": "verystrongpassword",   "metadata_public": {     "custom_field": "custom_value"   } }

It's important to note that the

metadata_public

field is not validated using the identity's JSON schema. You must ensure that the metadata you store is valid according to your requirements [Kratos Identity Metadata & Traits](https://www.ory.sh/docs/kratos/manage-identities/managing-users-identities-metadata). Also, keep in mind that while the identity owner can see this metadata (for example, when calling

/sessions/whoami

), they cannot modify it directly. Only administrators can update this field using the

/admin/identities

APIs [Kratos Identity Metadata & Traits](https://www.ory.sh/docs/kratos/manage-identities/managing-users-identities-metadata). Remember to adjust the payload according to your specific identity schema and registration flow requirements.