curl --request POST \
  --url 'https://api.musixmatch.com/ws/1.1/distribution.delivery.post?apikey=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "file_id": 123456,
  "partner_user_id": "123456",
  "artist": [
    {
      "spotify_artist_id": "4Z8W4fKeB5YxbusRsdQVPb",
      "partner_artist_id": "123456"
    }
  ]
}
'

import requests

url = "https://api.musixmatch.com/ws/1.1/distribution.delivery.post?apikey="

payload = {
    "file_id": 123456,
    "partner_user_id": "123456",
    "artist": [
        {
            "spotify_artist_id": "4Z8W4fKeB5YxbusRsdQVPb",
            "partner_artist_id": "123456"
        }
    ]
}
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({
    file_id: 123456,
    partner_user_id: '123456',
    artist: [{spotify_artist_id: '4Z8W4fKeB5YxbusRsdQVPb', partner_artist_id: '123456'}]
  })
};

fetch('https://api.musixmatch.com/ws/1.1/distribution.delivery.post?apikey=', 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.musixmatch.com/ws/1.1/distribution.delivery.post?apikey=",
  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([
    'file_id' => 123456,
    'partner_user_id' => '123456',
    'artist' => [
        [
                'spotify_artist_id' => '4Z8W4fKeB5YxbusRsdQVPb',
                'partner_artist_id' => '123456'
        ]
    ]
  ]),
  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://api.musixmatch.com/ws/1.1/distribution.delivery.post?apikey="

	payload := strings.NewReader("{\n  \"file_id\": 123456,\n  \"partner_user_id\": \"123456\",\n  \"artist\": [\n    {\n      \"spotify_artist_id\": \"4Z8W4fKeB5YxbusRsdQVPb\",\n      \"partner_artist_id\": \"123456\"\n    }\n  ]\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://api.musixmatch.com/ws/1.1/distribution.delivery.post?apikey=")
  .header("Content-Type", "application/json")
  .body("{\n  \"file_id\": 123456,\n  \"partner_user_id\": \"123456\",\n  \"artist\": [\n    {\n      \"spotify_artist_id\": \"4Z8W4fKeB5YxbusRsdQVPb\",\n      \"partner_artist_id\": \"123456\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.musixmatch.com/ws/1.1/distribution.delivery.post?apikey=")

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  \"file_id\": 123456,\n  \"partner_user_id\": \"123456\",\n  \"artist\": [\n    {\n      \"spotify_artist_id\": \"4Z8W4fKeB5YxbusRsdQVPb\",\n      \"partner_artist_id\": \"123456\"\n    }\n  ]\n}"

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

{
  "message": {
    "header": {
      "status_code": 201,
      "execute_time": 0.32
    },
    "body": {
      "delivery": {
        "delivery_id": 123456,
        "status": "pending"
      }
    }
  }
}

{
  "message": {
    "header": {
      "status_code": 123,
      "execute_time": 123
    },
    "body": {
      "error": {
        "code": "<string>",
        "namespace": "<string>",
        "extraData": "<unknown>"
      }
    }
  }
}

{
  "message": {
    "header": {
      "status_code": 123,
      "execute_time": 123
    },
    "body": {
      "error": {
        "code": "<string>",
        "namespace": "<string>",
        "extraData": "<unknown>"
      }
    }
  }
}

{
  "message": {
    "header": {
      "status_code": 404,
      "execute_time": 0.32
    },
    "body": {
      "error": {
        "code": "004"
      }
    }
  }
}

{
  "message": {
    "header": {
      "status_code": 123,
      "execute_time": 123
    },
    "body": {
      "error": {
        "code": "<string>",
        "namespace": "<string>",
        "extraData": "<unknown>"
      }
    }
  }
}