To choose a specific identity schema when doing registration with Ory Kratos, you need to customize the identity schema according to your requirements. The identity schema defines the structure and properties of user identities in your system. Here's how you can do it: 1. Define a custom identity schema: Create a JSON Schema file that specifies the traits and properties you want for your identities. This schema determines what information is collected during registration. 2. Configure the schema: In your Ory Kratos configuration, specify the path to your custom identity schema file. 3. Mark identifier fields: In your schema, mark the fields that should be used as identifiers for authentication. This is done using the

<http://ory.sh/kratos|ory.sh/kratos>

extension in the JSON Schema. Here's an example of how you can define a custom identity schema with email and username as identifiers:

json {   "$id": "<https://example.com/example.json>",   "$schema": "<http://json-schema.org/draft-07/schema#>",   "title": "Person",   "type": "object",   "properties": {     "traits": {       "type": "object",       "properties": {         "email": {           "type": "string",           "format": "email",           "<http://ory.sh/kratos|ory.sh/kratos>": {             "credentials": {               "password": {                 "identifier": true               }             }           }         },         "username": {           "type": "string",           "<http://ory.sh/kratos|ory.sh/kratos>": {             "credentials": {               "password": {                 "identifier": true               }             }           }         }       },       "additionalProperties": false     }   } }

This schema allows users to register and login using either their email or username as the identifier. For more detailed information on customizing identity schemas, you can refer to the following resources: 1. [Identity Schema Documentation](https://www.ory.sh/docs/kratos/manage-identities/identity-schema) 2. [Custom Identity Schema Example](https://www.ory.sh/docs/kratos/concepts/credentials/username-email-password#custom-identity-schema) Remember that when customizing your identity schema, you should include only the necessary information for authentication and core user profile data. Avoid storing business logic or sensitive information directly in the identity schema.

To specify a particular identity schema when using the registration API flow in Ory Kratos, you don't directly choose the schema in the API call. Instead, the schema is determined by the configuration of your Ory Kratos instance. However, you do need to provide the correct traits as defined in your identity schema when submitting the registration flow. Here's how it works: 1. Initiate the registration flow by making a GET request to the registration API endpoint. 2. In the response, you'll receive a flow object that includes an action URL and the required form fields based on your configured identity schema. 3. When submitting the registration data, you need to include the required traits as specified in your identity schema. Here's an example of how to initiate and complete a registration flow using the API:

bash # Initiate a Registration Flow actionUrl=$(   curl -s -X GET -H "Accept: application/json" \     "<https://playground.projects.oryapis.com/self-service/registration/api>" \     | jq -r '.ui.action' )  # Complete Registration Flow with password method curl -s -X POST -H  "Accept: application/json" -H "Content-Type: application/json" \     -d '{"traits.email": "<mailto:user@example.com|user@example.com>", "password": "password123", "method": "password"}' \     "$actionUrl" | jq

In this example, the traits (like email) are included in the JSON payload when completing the registration flow. The specific traits you need to include depend on your configured identity schema. If you have multiple identity schemas configured, Ory Kratos will use the default schema unless otherwise specified. To use a specific non-default schema, you would need to configure it server-side in your Ory Kratos setup. For more detailed information on the registration API flow, you can refer to the [Ory Kratos API documentation for registration](https://www.ory.sh/docs/kratos/self-service/flows/user-registration#api-clients). Remember, the structure of the traits in your API request should match the schema you've defined for your identities in your Ory Kratos configuration.

To specify a non-default identity schema in Ory Kratos when you have multiple schemas configured, you need to make changes to your server-side configuration. Here's how you can do it: 1. First, you need to define multiple schemas in your Ory Kratos configuration file. This is typically done in the

identity

section of your configuration. 2. You can then specify which schema should be the default, and define additional schemas. Here's an example of how to configure multiple schemas:

yaml identity:   default_schema_id: person   schemas:     - id: person       url: file:///path/to/person.schema.json     - id: customer       url: file:///path/to/customer.schema.json

In this configuration: -

default_schema_id: person

sets the "person" schema as the default. - Additional schemas are defined under

schemas

, each with a unique

id

and a

url

pointing to the schema file. To use a specific non-default schema (like "customer" in this example), you have two options: 1. For API calls: When creating an identity using the Admin API, you can specify the

schema_id

in the request body:

json    {      "schema_id": "customer",      "traits": {        // traits according to the customer schema      }    }

2. For self-service flows: You would need to implement custom logic in your application to choose the appropriate schema based on your requirements. This might involve creating different registration URLs or adding a step in your UI to select the schema type. It's important to note that changing schemas for existing identities can lead to data inconsistencies, so it's best to plan your schema strategy carefully from the start. For more detailed information on managing identity schemas, you can refer to the [Ory documentation on managing identity schemas](https://www.ory.sh/docs/identities/model/manage-identity-schema). Remember, these changes are made in your Ory Kratos configuration and potentially in your application logic, not in individual API calls for registration flows.

To select a specific identity schema for self-service flows in Ory Kratos, you need to implement custom logic in your application. Unfortunately, the knowledge sources provided don't contain specific information on how to dynamically select schemas during self-service flows. However, based on the available information, I can provide some general guidance: 1. Custom UI: You would need to create a custom user interface that allows users to choose the type of account they want to create. This selection would correspond to different identity schemas. 2. Flow Initialization: When initializing the registration flow, you might need to pass additional parameters or use different endpoints for different schemas. However, the exact method for doing this is not specified in the provided documentation. 3. Server-side Logic: You would need to implement server-side logic to interpret the user's choice and apply the appropriate schema to the registration flow. It's important to note that the ability to dynamically select schemas during self-service flows may be limited, as the documentation suggests that schema selection is primarily done through server-side configuration. For the most up-to-date and accurate information on implementing this kind of custom logic, I recommend: 1. Checking the latest [Ory Kratos documentation](https://www.ory.sh/docs/kratos/) for any updates on this feature. 2. Reaching out to the Ory community or support channels for specific guidance on implementing custom schema selection in self-service flows. 3. Considering whether your use case might be better served by using different registration URLs for different schemas, as this approach is mentioned in the documentation. Remember that implementing custom logic for schema selection should be done carefully to ensure security and consistency in your identity management system.