curl --request POST \
  --url https://api-sandbox.revolv3.com/api/Checkout \
  --header 'Content-Type: application/json-patch+json' \
  --header 'x-revolv3-token: <api-key>' \
  --data '
{
  "returnUrl": "https%3A%2F%2Fsite.com",
  "oneTimePayment": {
    "checkoutLineItems": [
      {
        "name": "Item 1",
        "description": "Item Description",
        "value": 9.99,
        "valueType": "Standard"
      },
      {
        "name": "Item 2",
        "description": "Item Description",
        "value": 21.99,
        "valueType": "Standard"
      }
    ]
  }
}
'

import requests

url = "https://api-sandbox.revolv3.com/api/Checkout"

payload = {
    "returnUrl": "https%3A%2F%2Fsite.com",
    "oneTimePayment": { "checkoutLineItems": [
            {
                "name": "Item 1",
                "description": "Item Description",
                "value": 9.99,
                "valueType": "Standard"
            },
            {
                "name": "Item 2",
                "description": "Item Description",
                "value": 21.99,
                "valueType": "Standard"
            }
        ] }
}
headers = {
    "x-revolv3-token": "<api-key>",
    "Content-Type": "application/json-patch+json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-revolv3-token': '<api-key>', 'Content-Type': 'application/json-patch+json'},
  body: JSON.stringify({
    returnUrl: 'https%3A%2F%2Fsite.com',
    oneTimePayment: {
      checkoutLineItems: [
        {
          name: 'Item 1',
          description: 'Item Description',
          value: 9.99,
          valueType: 'Standard'
        },
        {
          name: 'Item 2',
          description: 'Item Description',
          value: 21.99,
          valueType: 'Standard'
        }
      ]
    }
  })
};

fetch('https://api-sandbox.revolv3.com/api/Checkout', 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://api-sandbox.revolv3.com/api/Checkout",
  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([
    'returnUrl' => 'https%3A%2F%2Fsite.com',
    'oneTimePayment' => [
        'checkoutLineItems' => [
                [
                                'name' => 'Item 1',
                                'description' => 'Item Description',
                                'value' => 9.99,
                                'valueType' => 'Standard'
                ],
                [
                                'name' => 'Item 2',
                                'description' => 'Item Description',
                                'value' => 21.99,
                                'valueType' => 'Standard'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json-patch+json",
    "x-revolv3-token: <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://api-sandbox.revolv3.com/api/Checkout"

	payload := strings.NewReader("{\n  \"returnUrl\": \"https%3A%2F%2Fsite.com\",\n  \"oneTimePayment\": {\n    \"checkoutLineItems\": [\n      {\n        \"name\": \"Item 1\",\n        \"description\": \"Item Description\",\n        \"value\": 9.99,\n        \"valueType\": \"Standard\"\n      },\n      {\n        \"name\": \"Item 2\",\n        \"description\": \"Item Description\",\n        \"value\": 21.99,\n        \"valueType\": \"Standard\"\n      }\n    ]\n  }\n}")

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

	req.Header.Add("x-revolv3-token", "<api-key>")
	req.Header.Add("Content-Type", "application/json-patch+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://api-sandbox.revolv3.com/api/Checkout")
  .header("x-revolv3-token", "<api-key>")
  .header("Content-Type", "application/json-patch+json")
  .body("{\n  \"returnUrl\": \"https%3A%2F%2Fsite.com\",\n  \"oneTimePayment\": {\n    \"checkoutLineItems\": [\n      {\n        \"name\": \"Item 1\",\n        \"description\": \"Item Description\",\n        \"value\": 9.99,\n        \"valueType\": \"Standard\"\n      },\n      {\n        \"name\": \"Item 2\",\n        \"description\": \"Item Description\",\n        \"value\": 21.99,\n        \"valueType\": \"Standard\"\n      }\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api-sandbox.revolv3.com/api/Checkout")

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

request = Net::HTTP::Post.new(url)
request["x-revolv3-token"] = '<api-key>'
request["Content-Type"] = 'application/json-patch+json'
request.body = "{\n  \"returnUrl\": \"https%3A%2F%2Fsite.com\",\n  \"oneTimePayment\": {\n    \"checkoutLineItems\": [\n      {\n        \"name\": \"Item 1\",\n        \"description\": \"Item Description\",\n        \"value\": 9.99,\n        \"valueType\": \"Standard\"\n      },\n      {\n        \"name\": \"Item 2\",\n        \"description\": \"Item Description\",\n        \"value\": 21.99,\n        \"valueType\": \"Standard\"\n      }\n    ]\n  }\n}"

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

{
  "checkoutId": "12345678-ABCD-1234-EFGH-987654321000",
  "checkoutLink": "http://localhost:4200/checkout/12345678-ABCD-1234-EFGH-987654321000"
}

{
  "message": "Unable to perform the request action with provided data."
}

{
  "message": "Attempted to perform an unauthorized operation."
}