curl --request POST \
  --url https://sandbox.users.niobi.co/api/v2/stk-deposit \
  --header 'Content-Type: application/json' \
  --data '
{
  "client_id": "<string>",
  "sender": "<string>",
  "timestamp": 123,
  "salt": "<string>",
  "signature": "<string>",
  "params": {
    "country_id": 123,
    "correspondent": "MTN_MOMO_NGA",
    "currency": "<string>",
    "amount": 123,
    "mobile": "<string>",
    "callback_url": "<string>"
  }
}
'

import requests

url = "https://sandbox.users.niobi.co/api/v2/stk-deposit"

payload = {
    "client_id": "<string>",
    "sender": "<string>",
    "timestamp": 123,
    "salt": "<string>",
    "signature": "<string>",
    "params": {
        "country_id": 123,
        "correspondent": "MTN_MOMO_NGA",
        "currency": "<string>",
        "amount": 123,
        "mobile": "<string>",
        "callback_url": "<string>"
    }
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    client_id: '<string>',
    sender: '<string>',
    timestamp: 123,
    salt: '<string>',
    signature: '<string>',
    params: {
      country_id: 123,
      correspondent: 'MTN_MOMO_NGA',
      currency: '<string>',
      amount: 123,
      mobile: '<string>',
      callback_url: '<string>'
    }
  })
};

fetch('https://sandbox.users.niobi.co/api/v2/stk-deposit', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://sandbox.users.niobi.co/api/v2/stk-deposit",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'client_id' => '<string>',
    'sender' => '<string>',
    'timestamp' => 123,
    'salt' => '<string>',
    'signature' => '<string>',
    'params' => [
        'country_id' => 123,
        'correspondent' => 'MTN_MOMO_NGA',
        'currency' => '<string>',
        'amount' => 123,
        'mobile' => '<string>',
        'callback_url' => '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://sandbox.users.niobi.co/api/v2/stk-deposit"

	payload := strings.NewReader("{\n  \"client_id\": \"<string>\",\n  \"sender\": \"<string>\",\n  \"timestamp\": 123,\n  \"salt\": \"<string>\",\n  \"signature\": \"<string>\",\n  \"params\": {\n    \"country_id\": 123,\n    \"correspondent\": \"MTN_MOMO_NGA\",\n    \"currency\": \"<string>\",\n    \"amount\": 123,\n    \"mobile\": \"<string>\",\n    \"callback_url\": \"<string>\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://sandbox.users.niobi.co/api/v2/stk-deposit")
  .header("Content-Type", "application/json")
  .body("{\n  \"client_id\": \"<string>\",\n  \"sender\": \"<string>\",\n  \"timestamp\": 123,\n  \"salt\": \"<string>\",\n  \"signature\": \"<string>\",\n  \"params\": {\n    \"country_id\": 123,\n    \"correspondent\": \"MTN_MOMO_NGA\",\n    \"currency\": \"<string>\",\n    \"amount\": 123,\n    \"mobile\": \"<string>\",\n    \"callback_url\": \"<string>\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.users.niobi.co/api/v2/stk-deposit")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"client_id\": \"<string>\",\n  \"sender\": \"<string>\",\n  \"timestamp\": 123,\n  \"salt\": \"<string>\",\n  \"signature\": \"<string>\",\n  \"params\": {\n    \"country_id\": 123,\n    \"correspondent\": \"MTN_MOMO_NGA\",\n    \"currency\": \"<string>\",\n    \"amount\": 123,\n    \"mobile\": \"<string>\",\n    \"callback_url\": \"<string>\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "success": true,
  "message": "Verification token was sent to your mobile number. Kindly verify to proceed with payment.",
  "data": {}
}

{
  "success": false,
  "message": "Niobi user not found or Transaction was not created!"
}

{
  "success": false,
  "message": "Entity integration record not found or Client id not matched or Request was not verified."
}