curl "https://sendazi.com/api/v1/sms-campaigns/quick?to=233241234567&message=Hello%20from%20Sendazi!&sender_id=MYCOMPANY&api_key=YOUR_API_KEY"

{
  "success": true,
  "data": {
    "status": "success",
    "amount": 500.00,
    "credits_added": 2500,
    "reference": "TXN_1767234120056_zetjslzfe",
    "verified_at": "2026-01-15T16:00:00.000000Z"
  },
  "message": "Payment verified successfully. Credits have been added to your account."
}

{
  "success": false,
  "message": "Payment verification failed. Please contact support if you believe this is an error."
}

{
  "success": false,
  "message": "This payment has already been verified."
}