curl --request POST \
  --url https://api.clickpesa.com/third-parties/billpay/bulk-create-customer-control-numbers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "controlNumbers": [
    {
      "customerName": "John Doe",
      "customerEmail": "john@example.com",
      "billAmount": 25000
    },
    {
      "customerName": "Jane Smith",
      "customerPhone": "255712345678",
      "billReference": "CUST002"
    }
  ]
}
'

{
  "billPayNumbers": [
    "<string>"
  ],
  "created": 123,
  "failed": 123,
  "errors": [
    {
      "index": 123,
      "reason": "<string>"
    }
  ]
}