Description

Add functionality to onboard users automatically when they visit the chat app with a cashu token provided in the query parameters, along with support for a prompt parameter to pre-populate the chat interface.

Requirements

• Parse cashu token from URL query parameters (e.g., ?cashu=token_value)
• Parse prompt from URL query parameters (e.g., ?prompt=your_message_here)
• Support combined parameters (e.g., ?cashu=token_value&prompt=your_message_here)
• Validate the cashu token format and authenticity
• Automatically create/setup user account using the cashu token
• Handle token redemption process
• Pre-populate chat interface with the provided prompt message
• Provide user feedback during onboarding process
• Handle error cases (invalid token, expired token, etc.)
• Redirect user to appropriate chat interface after successful onboarding

Acceptance Criteria

• Users can visit chat.routstr.com with ?cashu=<token> and be automatically onboarded
• Users can visit chat.routstr.com with ?prompt=<message> to pre-populate the chat
• Users can visit chat.routstr.com with ?cashu=<token>&prompt=<message> for combined functionality
• Invalid or expired tokens show appropriate error messages
• Successful onboarding redirects to the main chat interface with prompt pre-populated (if provided)
• Token is consumed/redeemed during the onboarding process
• Prompt parameter is URL-decoded and properly displayed in the chat interface

Technical Notes

• Consider security implications of token handling
• Ensure proper error handling and user experience
• May need integration with cashu wallet/mint functionality
• Implement proper URL encoding/decoding for prompt parameter
• Handle special characters and long prompts appropriately