Provide examples for including user attributes in JWT

[fungc-io]

A very common use case that can be achieved by the new event hook feature

import { EventUserSessionJWTPreCreate, HookResponse } from "https://deno.land/x/authgear_deno_hook@v0.3.0/mod.ts";

export default async function(e: EventUserSessionJWTPreCreate): Promise<HookResponse> {
  // Write your hook with the help of the type definition.
  return { 
    mutations:{
      jwt: {
        payload:{
          ...e.payload.jwt.payload,
          standard_attributes: e.payload.user.standard_attributes,
          custom_attributes: e.payload.user.custom_attributes
        }
      }
    },
    is_allowed: true 
  };
}

[Boburmirzo]

@fungc-io Thanks for reporting this! We added a separate How-to guide for this case:

https://docs.authgear.com/how-to-guide/integration/add-custom-fields-to-a-jwt-access-token