User: upgrade my account
Agent: I can help you upgrade your account! This will increase your 
       transaction limits. Please send a clear photo of the FRONT 
       of your Sierra Leone National ID card.

User: [sends ID front photo]
Agent: Great! Now please send the BACK of your ID card.

User: [sends ID back photo]  
Agent: Your documents have been verified. Your account has been 
       upgraded to Enhanced level. Your new daily limit is 500,000 SLE.

{
  "valid": false,
  "fraudDetected": true,
  "fraudIndicators": [
    "OCR confidence below threshold (45%)",
    "Missing official header text",
    "ID number contains repeating pattern"
  ]
}

curl -X POST "https://demo.api.vultlocal.com/api/v1/subscribers/:id/kyc/upload" \
  -H "Authorization: Bearer olive_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "image_type": "id_front",
    "image_data": "data:image/jpeg;base64,/9j/4AAQSkZJRg..."
  }'

curl -X POST "https://demo.api.vultlocal.com/api/v1/subscribers/:id/kyc/upgrade" \
  -H "Authorization: Bearer olive_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "target_level": "enhanced",
    "id_front": "data:image/jpeg;base64,/9j/...",
    "id_back": "data:image/jpeg;base64,/9j/..."
  }'

{
  "success": true,
  "previous_level": "basic",
  "new_level": "enhanced",
  "subscriber_id": "sub_abc123",
  "validation": {
    "front": { "valid": true, "confidence": 0.95 },
    "back": { "valid": true, "confidence": 0.92 },
    "crossValidation": { "consistent": true }
  }
}