curl --request POST \
  --url https://sandbox.api.btdx.io/sessions \
  --header 'Content-Type: application/json' \
  --data '
{
  "appId": "ANAPPID",
  "walletId": "OPTIONAL-ONLY-IF-APIKEY-IS-TYPE-WALLET",
  "apiKey": "password1234"
}
'

import requests

url = "https://sandbox.api.btdx.io/sessions"

payload = {
    "appId": "ANAPPID",
    "walletId": "OPTIONAL-ONLY-IF-APIKEY-IS-TYPE-WALLET",
    "apiKey": "password1234"
}
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({
    appId: 'ANAPPID',
    walletId: 'OPTIONAL-ONLY-IF-APIKEY-IS-TYPE-WALLET',
    apiKey: 'password1234'
  })
};

fetch('https://sandbox.api.btdx.io/sessions', 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.api.btdx.io/sessions",
  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([
    'appId' => 'ANAPPID',
    'walletId' => 'OPTIONAL-ONLY-IF-APIKEY-IS-TYPE-WALLET',
    'apiKey' => 'password1234'
  ]),
  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.api.btdx.io/sessions"

	payload := strings.NewReader("{\n  \"appId\": \"ANAPPID\",\n  \"walletId\": \"OPTIONAL-ONLY-IF-APIKEY-IS-TYPE-WALLET\",\n  \"apiKey\": \"password1234\"\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.api.btdx.io/sessions")
  .header("Content-Type", "application/json")
  .body("{\n  \"appId\": \"ANAPPID\",\n  \"walletId\": \"OPTIONAL-ONLY-IF-APIKEY-IS-TYPE-WALLET\",\n  \"apiKey\": \"password1234\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.api.btdx.io/sessions")

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  \"appId\": \"ANAPPID\",\n  \"walletId\": \"OPTIONAL-ONLY-IF-APIKEY-IS-TYPE-WALLET\",\n  \"apiKey\": \"password1234\"\n}"

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

{
  "_meta": {
    "_primary_document": "sessions",
    "_count": 1
  },
  "sessions": [
    {
      "accessToken": "eyJ0eXAiOiJh....bBDA",
      "refreshToken": "eyJ0eXAiOiJy....uHCQ",
      "accessExpiresAt": "2099-01-01T23:59:59.999Z",
      "refreshExpiresAt": "2099-01-01T23:59:59.999Z"
    }
  ]
}

{
  "title": "Not found",
  "details": [
    "APIKey entity with ID of pa****34 not found for App with ID of ANAPPID"
  ]
}