M-Pesa API for developers

# Initiate STK Push
curl -X POST https://api.pesaflux.co.ke/v1/initiatestk \
  -H "Content-Type: application/json" \
  -d '{
    "api_key": "PSFX...",
    "email": "you@business.co.ke",
    "amount": "100",
    "msisdn": "254712345678",
    "reference": "INV-1024"
  }'

# Response
{
  "success": "200",
  "message": "Please enter your MPESA PIN to complete the transaction",
  "transaction_request_id": "PLFX0610202614..."
}

// Initiate STK Push
$payload = json_encode([
    'api_key'   => 'PSFX...',
    'email'     => 'you@business.co.ke',
    'amount'    => '100',
    'msisdn'    => '254712345678',
    'reference' => 'INV-1024',
]);

$ch = curl_init('https://api.pesaflux.co.ke/v1/initiatestk');
curl_setopt_array($ch, [
    CURLOPT_POST           => true,
    CURLOPT_POSTFIELDS     => $payload,
    CURLOPT_HTTPHEADER     => ['Content-Type: application/json'],
    CURLOPT_RETURNTRANSFER => true,
]);
$response = json_decode(curl_exec($ch), true);
// $response['transaction_request_id']

// Initiate STK Push
const res = await fetch('https://api.pesaflux.co.ke/v1/initiatestk', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    api_key: 'PSFX...',
    email: 'you@business.co.ke',
    amount: '100',
    msisdn: '254712345678',
    reference: 'INV-1024',
  }),
});

const data = await res.json();
// data.transaction_request_id