curl --request POST \
  --url https://mainnet.gomaestro-api.org/v1/contracts/subscription/initSubscription \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '
{
  "service_nft_tn": "<string>",
  "account_nft_tn": "<string>",
  "subscription_fee": {
    "policy_id": "<string>",
    "asset_name": "<string>"
  },
  "total_subscription_fee": "<string>",
  "subscription_start": "<string>",
  "subscription_end": "<string>",
  "interval_length": "<string>",
  "interval_amount": "<string>",
  "num_intervals": "<string>",
  "last_claimed": "<string>",
  "penalty_fee": {
    "policy_id": "<string>",
    "asset_name": "<string>"
  },
  "penalty_fee_qty": "<string>",
  "minimum_ada": "<string>"
}
'

import requests

url = "https://mainnet.gomaestro-api.org/v1/contracts/subscription/initSubscription"

payload = {
    "service_nft_tn": "<string>",
    "account_nft_tn": "<string>",
    "subscription_fee": {
        "policy_id": "<string>",
        "asset_name": "<string>"
    },
    "total_subscription_fee": "<string>",
    "subscription_start": "<string>",
    "subscription_end": "<string>",
    "interval_length": "<string>",
    "interval_amount": "<string>",
    "num_intervals": "<string>",
    "last_claimed": "<string>",
    "penalty_fee": {
        "policy_id": "<string>",
        "asset_name": "<string>"
    },
    "penalty_fee_qty": "<string>",
    "minimum_ada": "<string>"
}
headers = {
    "api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    service_nft_tn: '<string>',
    account_nft_tn: '<string>',
    subscription_fee: {policy_id: '<string>', asset_name: '<string>'},
    total_subscription_fee: '<string>',
    subscription_start: '<string>',
    subscription_end: '<string>',
    interval_length: '<string>',
    interval_amount: '<string>',
    num_intervals: '<string>',
    last_claimed: '<string>',
    penalty_fee: {policy_id: '<string>', asset_name: '<string>'},
    penalty_fee_qty: '<string>',
    minimum_ada: '<string>'
  })
};

fetch('https://mainnet.gomaestro-api.org/v1/contracts/subscription/initSubscription', 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://mainnet.gomaestro-api.org/v1/contracts/subscription/initSubscription",
  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([
    'service_nft_tn' => '<string>',
    'account_nft_tn' => '<string>',
    'subscription_fee' => [
        'policy_id' => '<string>',
        'asset_name' => '<string>'
    ],
    'total_subscription_fee' => '<string>',
    'subscription_start' => '<string>',
    'subscription_end' => '<string>',
    'interval_length' => '<string>',
    'interval_amount' => '<string>',
    'num_intervals' => '<string>',
    'last_claimed' => '<string>',
    'penalty_fee' => [
        'policy_id' => '<string>',
        'asset_name' => '<string>'
    ],
    'penalty_fee_qty' => '<string>',
    'minimum_ada' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "api-key: <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://mainnet.gomaestro-api.org/v1/contracts/subscription/initSubscription"

	payload := strings.NewReader("{\n  \"service_nft_tn\": \"<string>\",\n  \"account_nft_tn\": \"<string>\",\n  \"subscription_fee\": {\n    \"policy_id\": \"<string>\",\n    \"asset_name\": \"<string>\"\n  },\n  \"total_subscription_fee\": \"<string>\",\n  \"subscription_start\": \"<string>\",\n  \"subscription_end\": \"<string>\",\n  \"interval_length\": \"<string>\",\n  \"interval_amount\": \"<string>\",\n  \"num_intervals\": \"<string>\",\n  \"last_claimed\": \"<string>\",\n  \"penalty_fee\": {\n    \"policy_id\": \"<string>\",\n    \"asset_name\": \"<string>\"\n  },\n  \"penalty_fee_qty\": \"<string>\",\n  \"minimum_ada\": \"<string>\"\n}")

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

	req.Header.Add("api-key", "<api-key>")
	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://mainnet.gomaestro-api.org/v1/contracts/subscription/initSubscription")
  .header("api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"service_nft_tn\": \"<string>\",\n  \"account_nft_tn\": \"<string>\",\n  \"subscription_fee\": {\n    \"policy_id\": \"<string>\",\n    \"asset_name\": \"<string>\"\n  },\n  \"total_subscription_fee\": \"<string>\",\n  \"subscription_start\": \"<string>\",\n  \"subscription_end\": \"<string>\",\n  \"interval_length\": \"<string>\",\n  \"interval_amount\": \"<string>\",\n  \"num_intervals\": \"<string>\",\n  \"last_claimed\": \"<string>\",\n  \"penalty_fee\": {\n    \"policy_id\": \"<string>\",\n    \"asset_name\": \"<string>\"\n  },\n  \"penalty_fee_qty\": \"<string>\",\n  \"minimum_ada\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://mainnet.gomaestro-api.org/v1/contracts/subscription/initSubscription")

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

request = Net::HTTP::Post.new(url)
request["api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"service_nft_tn\": \"<string>\",\n  \"account_nft_tn\": \"<string>\",\n  \"subscription_fee\": {\n    \"policy_id\": \"<string>\",\n    \"asset_name\": \"<string>\"\n  },\n  \"total_subscription_fee\": \"<string>\",\n  \"subscription_start\": \"<string>\",\n  \"subscription_end\": \"<string>\",\n  \"interval_length\": \"<string>\",\n  \"interval_amount\": \"<string>\",\n  \"num_intervals\": \"<string>\",\n  \"last_claimed\": \"<string>\",\n  \"penalty_fee\": {\n    \"policy_id\": \"<string>\",\n    \"asset_name\": \"<string>\"\n  },\n  \"penalty_fee_qty\": \"<string>\",\n  \"minimum_ada\": \"<string>\"\n}"

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

{
  "cbor_hex": "<string>",
  "tx_hash": "<string>"
}