User Story
As a business user registering on the platform,
I want to provide my monthly transaction volume, website URL, and business description during signup
So that the platform can verify my business legitimacy and provide appropriate service tiers.

Acceptance Criteria

1. GIVEN a user registers with any business scope (sender/provider)
   WHEN they submit the registration form
   THEN they must provide a positive monthly volume value

2. GIVEN a user registers with sender scope
   WHEN they submit optional business details
   THEN the system should validate website URLs and text length limits

3. GIVEN a user submits invalid business information
   WHEN the registration is attempted
   THEN clear validation errors should appear before form submission

4. GIVEN a successful registration
   WHEN the profile is created
   THEN all business information should persist in the correct profile type

Tech Details

1. Database Migrations:

   • Add optional monthly_volume column to both profile tables
   • Add optional columns for sender-specific fields

2. Validation Rules:

   • Monthly volume: decimal > 0
   • Business website: optional valid URL
   • Nature of business: optional 255 char limit

3. API Changes:

   • Extend RegisterPayload struct with new fields
   • Modify profile creation handlers

Notes/Assumptions

1. Existing users will be grandfathered in with null/zero values
2. All new business registrations require monthly volume disclosure
3. Sender profiles get enhanced with optional business details