curl --request PATCH \
  --url https://api.cashful.africa/api/canary/products/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "metadata": {
    "sku": "PROD-001"
  }
}
'

{
  "id": "product_001",
  "merchantId": "merchant_456",
  "name": "Airtime",
  "description": "Mobile phone airtime",
  "amount": 5000,
  "currency": "ZAR",
  "active": true,
  "imageId": "file_abc123xyz",
  "imageUrl": "https://my-bucket.s3.af-south-1.amazonaws.com/merchant_123/1736951234567-a1b2c3-airtime.png",
  "metadata": {
    "category": "telecom",
    "provider": "vodacom"
  },
  "createdAt": "2025-01-15T10:30:00.000Z",
  "updatedAt": "2025-01-15T10:30:00.000Z"
}