curl --request POST \
  --url https://doc-api.oppiwallet.com/api/v3/createTransactionRequest \
  --header 'signatureToken: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...' \
  --header 'Content-Type: application/json' \
  --data '{
    "currency": "6698aec7f188ae24c673da1c",
    "amount": "0.01",
    "orderId": "ORDER_1",
    "isCheckBalance": true,
    "description": "Payment for order #1",
    "callbackUrl": "https://yourdomain.com/callback",
    "success_url": "https://yourdomain.com/success",
    "cancel_url": "https://yourdomain.com/cancel"
  }'

const axios = require('axios');

let data = JSON.stringify({
  "currency": "6698aec7f188ae24c673da1c",
  "amount": "0.01",
  "orderId": "ORDER_1",
  "isCheckBalance": true,
  "description": "Payment for order #1",
  "callbackUrl": "https://yourdomain.com/callback",
  "success_url": "https://yourdomain.com/success",
  "cancel_url": "https://yourdomain.com/cancel"
});

let config = {
  method: 'post',
  maxBodyLength: Infinity,
  url: 'https://doc-api.oppiwallet.com/api/v3/createTransactionRequest',
  headers: { 
    'signatureToken': 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1cmkiOiJjcmVhdGVUcmFuc2FjdGlvblJlcXVlc3QiLCJpYXQiOjE3MTUxNTM2NTQsImV4cCI6MTcxNTE1MzcwOSwia2V5Ijoicmh0TmJELU9yTFQteFp3M3QtMkpFWnR4Iiwic2lnbmF0dXJlU3RyaW5nIjoiMWVjY2M1NDc0YWZiMzU4NDExNDEzNjBkOGQ0MDBlMWYxOWIzNRjYzVkM2YxNTRjNmQ5YjViNSJ9.JuF7d8Oc4EyMvm7s5g3CN9L9Wbl_TFI_yO8jt20dvHw',
    'Content-Type': 'application/json'
  },
  data: data
};

axios.request(config)
  .then((response) => {
    console.log(JSON.stringify(response.data));
  })
  .catch((error) => {
    console.log(error);
  });

import requests

url = "https://doc-api.oppiwallet.com/api/v3/createTransactionRequest"

headers = {
    "signatureToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
    "Content-Type": "application/json"
}

data = {
    "currency": "6698aec7f188ae24c673da1c",
    "amount": "0.01",
    "orderId": "ORDER_1",
    "isCheckBalance": True,
    "description": "Payment for order #1",
    "callbackUrl": "https://yourdomain.com/callback",
    "success_url": "https://yourdomain.com/success",
    "cancel_url": "https://yourdomain.com/cancel"
}

response = requests.post(url, headers=headers, json=data)
print(response.json())

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"io/ioutil"
)

func main() {
	url := "https://doc-api.oppiwallet.com/api/v3/createTransactionRequest"

	data := map[string]interface{}{
		"currency":       "6698aec7f188ae24c673da1c",
		"amount":         "0.01",
		"orderId":        "ORDER_1",
		"isCheckBalance": true,
		"description":    "Payment for order #1",
		"callbackUrl":    "https://yourdomain.com/callback",
		"success_url":    "https://yourdomain.com/success",
		"cancel_url":     "https://yourdomain.com/cancel",
	}

	jsonData, _ := json.Marshal(data)

	req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
	req.Header.Add("signatureToken", "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)
	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(string(body))
}

<?php
$curl = curl_init();

$data = [
    "currency" => "6698aec7f188ae24c673da1c",
    "amount" => "0.01",
    "orderId" => "ORDER_1",
    "isCheckBalance" => true,
    "description" => "Payment for order #1",
    "callbackUrl" => "https://yourdomain.com/callback",
    "success_url" => "https://yourdomain.com/success",
    "cancel_url" => "https://yourdomain.com/cancel"
];

curl_setopt_array($curl, [
  CURLOPT_URL => "https://doc-api.oppiwallet.com/api/v3/createTransactionRequest",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_HTTPHEADER => [
    "signatureToken: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
    "Content-Type: application/json"
  ],
  CURLOPT_POSTFIELDS => json_encode($data),
]);

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

curl_close($curl);

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

{
  "address": "0x6648C29C6FD8........eD9Eb964c6F838bF",
  "amount": "0.0001",
  "tag": "2165464",
  "transactionId": "0866f8-4a53-4579-9274-351ec868a627",
  "link": "https://demo.oppipayment.com/0866f8-4a53-4579-9274-351ec868a627"
}

{
  "message": "Error message"
}