curl --request POST \
  --url https://api.ctrl-hub.com/v3/scheme-registrations \
  --header 'Content-Type: application/vnd.api+json' \
  --header 'X-Session-Token: <api-key>' \
  --data '
{
  "data": {
    "type": "scheme-registrations",
    "attributes": {
      "expires_at": "2023-11-07T05:31:56Z",
      "expected_by": "2023-11-07T05:31:56Z",
      "exemption_comment": "Office-based role. Never works on the network."
    },
    "relationships": {
      "user": {
        "data": {
          "type": "users",
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
        }
      },
      "skills_register_scheme": {
        "data": {
          "type": "skills-register-schemes",
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
        }
      },
      "skills_register_scheme_categories": {
        "data": [
          {
            "type": "skills-register-scheme-categories",
            "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
          }
        ]
      }
    }
  }
}
'

import requests

url = "https://api.ctrl-hub.com/v3/scheme-registrations"

payload = { "data": {
        "type": "scheme-registrations",
        "attributes": {
            "expires_at": "2023-11-07T05:31:56Z",
            "expected_by": "2023-11-07T05:31:56Z",
            "exemption_comment": "Office-based role. Never works on the network."
        },
        "relationships": {
            "user": { "data": {
                    "type": "users",
                    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
                } },
            "skills_register_scheme": { "data": {
                    "type": "skills-register-schemes",
                    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
                } },
            "skills_register_scheme_categories": { "data": [
                    {
                        "type": "skills-register-scheme-categories",
                        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
                    }
                ] }
        }
    } }
headers = {
    "X-Session-Token": "<api-key>",
    "Content-Type": "application/vnd.api+json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-Session-Token': '<api-key>', 'Content-Type': 'application/vnd.api+json'},
  body: JSON.stringify({
    data: {
      type: 'scheme-registrations',
      attributes: {
        expires_at: '2023-11-07T05:31:56Z',
        expected_by: '2023-11-07T05:31:56Z',
        exemption_comment: 'Office-based role. Never works on the network.'
      },
      relationships: {
        user: {data: {type: 'users', id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'}},
        skills_register_scheme: {
          data: {type: 'skills-register-schemes', id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'}
        },
        skills_register_scheme_categories: {
          data: [
            {
              type: 'skills-register-scheme-categories',
              id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'
            }
          ]
        }
      }
    }
  })
};

fetch('https://api.ctrl-hub.com/v3/scheme-registrations', 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.ctrl-hub.com/v3/scheme-registrations",
  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' => [
        'type' => 'scheme-registrations',
        'attributes' => [
                'expires_at' => '2023-11-07T05:31:56Z',
                'expected_by' => '2023-11-07T05:31:56Z',
                'exemption_comment' => 'Office-based role. Never works on the network.'
        ],
        'relationships' => [
                'user' => [
                                'data' => [
                                                                'type' => 'users',
                                                                'id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
                                ]
                ],
                'skills_register_scheme' => [
                                'data' => [
                                                                'type' => 'skills-register-schemes',
                                                                'id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
                                ]
                ],
                'skills_register_scheme_categories' => [
                                'data' => [
                                                                [
                                                                                                                                'type' => 'skills-register-scheme-categories',
                                                                                                                                'id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
                                                                ]
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/vnd.api+json",
    "X-Session-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.ctrl-hub.com/v3/scheme-registrations"

	payload := strings.NewReader("{\n  \"data\": {\n    \"type\": \"scheme-registrations\",\n    \"attributes\": {\n      \"expires_at\": \"2023-11-07T05:31:56Z\",\n      \"expected_by\": \"2023-11-07T05:31:56Z\",\n      \"exemption_comment\": \"Office-based role. Never works on the network.\"\n    },\n    \"relationships\": {\n      \"user\": {\n        \"data\": {\n          \"type\": \"users\",\n          \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n        }\n      },\n      \"skills_register_scheme\": {\n        \"data\": {\n          \"type\": \"skills-register-schemes\",\n          \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n        }\n      },\n      \"skills_register_scheme_categories\": {\n        \"data\": [\n          {\n            \"type\": \"skills-register-scheme-categories\",\n            \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n          }\n        ]\n      }\n    }\n  }\n}")

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

	req.Header.Add("X-Session-Token", "<api-key>")
	req.Header.Add("Content-Type", "application/vnd.api+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.ctrl-hub.com/v3/scheme-registrations")
  .header("X-Session-Token", "<api-key>")
  .header("Content-Type", "application/vnd.api+json")
  .body("{\n  \"data\": {\n    \"type\": \"scheme-registrations\",\n    \"attributes\": {\n      \"expires_at\": \"2023-11-07T05:31:56Z\",\n      \"expected_by\": \"2023-11-07T05:31:56Z\",\n      \"exemption_comment\": \"Office-based role. Never works on the network.\"\n    },\n    \"relationships\": {\n      \"user\": {\n        \"data\": {\n          \"type\": \"users\",\n          \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n        }\n      },\n      \"skills_register_scheme\": {\n        \"data\": {\n          \"type\": \"skills-register-schemes\",\n          \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n        }\n      },\n      \"skills_register_scheme_categories\": {\n        \"data\": [\n          {\n            \"type\": \"skills-register-scheme-categories\",\n            \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n          }\n        ]\n      }\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.ctrl-hub.com/v3/scheme-registrations")

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

request = Net::HTTP::Post.new(url)
request["X-Session-Token"] = '<api-key>'
request["Content-Type"] = 'application/vnd.api+json'
request.body = "{\n  \"data\": {\n    \"type\": \"scheme-registrations\",\n    \"attributes\": {\n      \"expires_at\": \"2023-11-07T05:31:56Z\",\n      \"expected_by\": \"2023-11-07T05:31:56Z\",\n      \"exemption_comment\": \"Office-based role. Never works on the network.\"\n    },\n    \"relationships\": {\n      \"user\": {\n        \"data\": {\n          \"type\": \"users\",\n          \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n        }\n      },\n      \"skills_register_scheme\": {\n        \"data\": {\n          \"type\": \"skills-register-schemes\",\n          \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n        }\n      },\n      \"skills_register_scheme_categories\": {\n        \"data\": [\n          {\n            \"type\": \"skills-register-scheme-categories\",\n            \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n          }\n        ]\n      }\n    }\n  }\n}"

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

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "type": "scheme-registrations",
    "attributes": {
      "expected_by": "2023-11-07T05:31:56Z",
      "kind": "expected_first_assessment",
      "expires_at": "2023-11-07T05:31:56Z",
      "risk_status": "none",
      "next_check": "2023-11-07T05:31:56Z",
      "exemption_comment": "Office-based role. Never works on the network."
    },
    "relationships": {
      "user": {
        "data": {
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "type": "users"
        }
      },
      "skills_register_scheme": {
        "data": {
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "type": "skills-register-schemes"
        }
      },
      "skills_register_scheme_categories": {
        "data": [
          {
            "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "type": "skills-register-scheme-categories"
          }
        ]
      }
    }
  },
  "jsonapi": {
    "version": "1.0"
  }
}

{
  "id": "98ca4a78-b66f-4234-9719-aaf832ee6669",
  "status": "400",
  "title": "A validation error was encountered",
  "source": {
    "parameter": "include"
  },
  "meta": {
    "resource": "wrong_value"
  }
}

{
  "id": "05fc9c8d-73b9-4697-9337-57f7a567a48f",
  "status": "401",
  "title": "You are not authorised to access this resource",
  "detail": "In order to access this resource, you need the 'admin' role.",
  "code": "AUTH.001"
}

{
  "id": "8e2f9a34-b5c6-4d7e-9f8a-2b3c4d5e6f7g",
  "status": "409",
  "title": "Conflict",
  "detail": "The request conflicts with the current state of the resource.",
  "code": "CONFLICT.001"
}

{
  "id": "fe9d9a69-f0a7-4fdc-bb2c-176027f316c5",
  "status": "500",
  "title": "Internal Server Error",
  "detail": "An unexpected error occurred on the server."
}