The webhook validates phone numbers. Here are some test cases:
| Phone | Expected | Reason |
|---|---|---|
| 6125551234 | ✅ Valid | Standard 10-digit |
| 16125551234 | ✅ Valid | 11-digit with leading 1 |
| (612) 555-1234 | ✅ Valid | Formatted |
| 612-555-1234 | ✅ Valid | Dashes |
| 5551234567 | ❌ Invalid | Starts with 555 |
| 0000000000 | ❌ Invalid | All zeros |
| 1111111111 | ❌ Invalid | All same digit |
| 1234567890 | ❌ Invalid | Sequential |
| 12345 | ❌ Invalid | Too short |
| ⚠️ Empty | No phone provided |
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