// Set the api and public key as follows . Copy it from Mpesa Developer Console (https://developer.mpesa.vm.co.mz/) .
$mpesa = new \Karson\MpesaPhpSdk\Mpesa();
$mpesa->setApiKey('your api key');
$mpesa->setPublicKey('your public key');
$mpesa->setServiceProviderCode('your public key');
$mpesa->setEnv('test');// 'live' production environment 

//This creates transaction between an M-Pesa service provider code to a phone number registered on M-Pesa.
$invoice_id = "FT0001"; // Eg: Invoice number
$phone_number = "258841234567"; // Prefixed with country code (258)
$amount = "10"; // Payment amount
$reference_id = "XBRAND001"; // Should be unique for each transaction

$result = $mpesa->c2b($invoice_id, $phone_number, $amount, $reference_id);

var_dump($result);

// Set the api, public key, provider and environment secret as follows in your .env file

MPESA_API_KEY ="Your API Key";
MPESA_PUBLIC_KEY='You Public Key'
MPESA_ENV='test' // 'live' production environment
MPESA_SERVICE_PROVIDER_CODE=171717