Create STK Push

curl -X POST "https://fortpesa.co.ke/api/v1/payments/stk" \
  -H "Authorization: Bearer pb_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 15000,
    "phone": "0712345678",
    "account_reference": "INV-2041",
    "channel_id": 42
  }'

const res = await fetch("https://fortpesa.co.ke/api/v1/payments/stk", {
  method: "POST",
  headers: {
    Authorization: "Bearer pb_live_YOUR_KEY",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    amount: 15000,
    phone: "0712345678",
    account_reference: "INV-2041",
    channel_id: 42, // optional
  }),
});

const body = await res.json();
if (res.status !== 201) throw new Error(body.error.message);
console.log(body.data.uuid, body.data.status);

import requests

res = requests.post(
    "https://fortpesa.co.ke/api/v1/payments/stk",
    headers={"Authorization": "Bearer pb_live_YOUR_KEY"},
    json={
        "amount": 15000,
        "phone": "0712345678",
        "account_reference": "INV-2041",
        "channel_id": 42,  # optional
    },
    timeout=30,
)
body = res.json()
if res.status_code != 201:
    raise RuntimeError(body["error"]["message"])

use GuzzleHttp\Client;

$client = new Client();
$res = $client->post('https://fortpesa.co.ke/api/v1/payments/stk', [
    'headers' => ['Authorization' => 'Bearer pb_live_YOUR_KEY'],
    'json' => [
        'amount' => 15000,
        'phone' => '0712345678',
        'account_reference' => 'INV-2041',
        'channel_id' => 42, // optional
    ],
]);