No device token stored. Please verify a magic link first.
This endpoint validates device_token and creates a session seamlessly. It's the primary deep link handler.
Request Parameters
POST https://read.lovelettersfromgod.com/auth/exchange
Long-lived device token
For device binding validation
To associate session with content
Expected Response
{
"success": true,
"session_id": "string",
"user_id": "string",
"letter_key": "string (optional)"
}