curl --request POST \
  --url https://int-api.mx.com/users/{user_identifier}/members/{member_identifier}/oauth/authorization_url \
  --header 'Accept-Version: <accept-version>' \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data_request": {
    "products": [
      "transactions"
    ]
  },
  "oauth": {
    "client_redirect_url": "https://{yoursite.com}",
    "enable_app2app": false,
    "referral_source": "APP"
  }
}
'

import requests

url = "https://int-api.mx.com/users/{user_identifier}/members/{member_identifier}/oauth/authorization_url"

payload = {
    "data_request": { "products": ["transactions"] },
    "oauth": {
        "client_redirect_url": "https://{yoursite.com}",
        "enable_app2app": False,
        "referral_source": "APP"
    }
}
headers = {
    "Accept-Version": "<accept-version>",
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Accept-Version': '<accept-version>',
    Authorization: 'Basic <encoded-value>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    data_request: {products: ['transactions']},
    oauth: {
      client_redirect_url: 'https://{yoursite.com}',
      enable_app2app: false,
      referral_source: 'APP'
    }
  })
};

fetch('https://int-api.mx.com/users/{user_identifier}/members/{member_identifier}/oauth/authorization_url', 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://int-api.mx.com/users/{user_identifier}/members/{member_identifier}/oauth/authorization_url",
  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([
    'data_request' => [
        'products' => [
                'transactions'
        ]
    ],
    'oauth' => [
        'client_redirect_url' => 'https://{yoursite.com}',
        'enable_app2app' => false,
        'referral_source' => 'APP'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Accept-Version: <accept-version>",
    "Authorization: Basic <encoded-value>",
    "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://int-api.mx.com/users/{user_identifier}/members/{member_identifier}/oauth/authorization_url"

	payload := strings.NewReader("{\n  \"data_request\": {\n    \"products\": [\n      \"transactions\"\n    ]\n  },\n  \"oauth\": {\n    \"client_redirect_url\": \"https://{yoursite.com}\",\n    \"enable_app2app\": false,\n    \"referral_source\": \"APP\"\n  }\n}")

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

	req.Header.Add("Accept-Version", "<accept-version>")
	req.Header.Add("Authorization", "Basic <encoded-value>")
	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://int-api.mx.com/users/{user_identifier}/members/{member_identifier}/oauth/authorization_url")
  .header("Accept-Version", "<accept-version>")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data_request\": {\n    \"products\": [\n      \"transactions\"\n    ]\n  },\n  \"oauth\": {\n    \"client_redirect_url\": \"https://{yoursite.com}\",\n    \"enable_app2app\": false,\n    \"referral_source\": \"APP\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://int-api.mx.com/users/{user_identifier}/members/{member_identifier}/oauth/authorization_url")

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

request = Net::HTTP::Post.new(url)
request["Accept-Version"] = '<accept-version>'
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"data_request\": {\n    \"products\": [\n      \"transactions\"\n    ]\n  },\n  \"oauth\": {\n    \"client_redirect_url\": \"https://{yoursite.com}\",\n    \"enable_app2app\": false,\n    \"referral_source\": \"APP\"\n  }\n}"

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

{
  "oauth": {
    "is_oauth": true,
    "authorization_url": "https://mxbank.mx.com/oauth/authorize?client_id=b8OikQ4Ep",
    "self": "/users/USR-11141024-90b3-1bce-cac9-c06ced52ab4c/members/MBR-7c6f361b-e582-15b6-60c0-358f12466b4b/oauth/authorization_url",
    "member": {
      "guid": "MBR-7c6f361b-e582-15b6-60c0-358f12466b4b",
      "id": "unique_id",
      "metadata": "some metadata",
      "name": "MX Bank",
      "self": "/users/USR-11141024-90b3-1bce-cac9-c06ced52ab4c/members/MBR-7c6f361b-e582-15b6-60c0-358f12466b4b"
    },
    "user": {
      "guid": "USR-11141024-90b3-1bce-cac9-c06ced52ab4c",
      "id": "unique_id",
      "metadata": "some metadata",
      "self": "/users/USR-11141024-90b3-1bce-cac9-c06ced52ab4c"
    }
  }
}