curl --request POST \
  --url https://sandbox.cashfree.com/pg/terminal/transactions \
  --header 'Content-Type: application/json' \
  --header 'x-api-version: <x-api-version>' \
  --header 'x-client-id: <api-key>' \
  --header 'x-client-secret: <api-key>' \
  --data '
{
  "cf_order_id": "12345",
  "cf_terminal_id": 54321,
  "payment_method": "john@cashfree.com",
  "terminal_phone_no": "9898989898",
  "add_invoice": false
}
'

import requests

url = "https://sandbox.cashfree.com/pg/terminal/transactions"

payload = {
    "cf_order_id": "12345",
    "cf_terminal_id": 54321,
    "payment_method": "john@cashfree.com",
    "terminal_phone_no": "9898989898",
    "add_invoice": False
}
headers = {
    "x-api-version": "<x-api-version>",
    "x-client-id": "<api-key>",
    "x-client-secret": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'x-api-version': '<x-api-version>',
    'x-client-id': '<api-key>',
    'x-client-secret': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    cf_order_id: '12345',
    cf_terminal_id: 54321,
    payment_method: 'john@cashfree.com',
    terminal_phone_no: '9898989898',
    add_invoice: false
  })
};

fetch('https://sandbox.cashfree.com/pg/terminal/transactions', 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.cashfree.com/pg/terminal/transactions",
  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([
    'cf_order_id' => '12345',
    'cf_terminal_id' => 54321,
    'payment_method' => 'john@cashfree.com',
    'terminal_phone_no' => '9898989898',
    'add_invoice' => false
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-version: <x-api-version>",
    "x-client-id: <api-key>",
    "x-client-secret: <api-key>"
  ],
]);

$response = curl_exec($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.cashfree.com/pg/terminal/transactions"

	payload := strings.NewReader("{\n  \"cf_order_id\": \"12345\",\n  \"cf_terminal_id\": 54321,\n  \"payment_method\": \"john@cashfree.com\",\n  \"terminal_phone_no\": \"9898989898\",\n  \"add_invoice\": false\n}")

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

	req.Header.Add("x-api-version", "<x-api-version>")
	req.Header.Add("x-client-id", "<api-key>")
	req.Header.Add("x-client-secret", "<api-key>")
	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.cashfree.com/pg/terminal/transactions")
  .header("x-api-version", "<x-api-version>")
  .header("x-client-id", "<api-key>")
  .header("x-client-secret", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"cf_order_id\": \"12345\",\n  \"cf_terminal_id\": 54321,\n  \"payment_method\": \"john@cashfree.com\",\n  \"terminal_phone_no\": \"9898989898\",\n  \"add_invoice\": false\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.cashfree.com/pg/terminal/transactions")

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

request = Net::HTTP::Post.new(url)
request["x-api-version"] = '<x-api-version>'
request["x-client-id"] = '<api-key>'
request["x-client-secret"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"cf_order_id\": \"12345\",\n  \"cf_terminal_id\": 54321,\n  \"payment_method\": \"john@cashfree.com\",\n  \"terminal_phone_no\": \"9898989898\",\n  \"add_invoice\": false\n}"

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

{
  "cf_payment_id": 42887,
  "payment_amount": 10,
  "payment_method": "LINK",
  "payment_url": "https://payments-test.cashfree.com/order/#4jWjotaRWEizB1BiCtPf",
  "qrcode": "data:image/png;base64,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",
  "timeout": "300000"
}

{
  "message": "bad URL, please check API documentation",
  "code": "request_failed",
  "type": "invalid_request_error"
}

{
  "message": "authentication Failed",
  "code": "request_failed",
  "type": "authentication_error"
}

{
  "message": "something is not found",
  "code": "somethind_not_found",
  "type": "invalid_request_error"
}

{
  "message": "order with same id is already present",
  "code": "order_already_exists",
  "type": "invalid_request_error"
}

{
  "message": "something is not found",
  "code": "request_invalid",
  "type": "idempotency_error"
}

{
  "message": "Too many requests from IP. Check headers",
  "code": "request_failed",
  "type": "rate_limit_error"
}

{
  "message": "internal Server Error",
  "code": "internal_error",
  "type": "api_error"
}