curl --request POST \
  --url https://api.qa.sima.ag/api/v3/third_party/plots \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: */*' \
  --header 'X-SIMA-SYSTEM-ID: <api-key>' \
  --data '
"\"{\\n    \\\"area\\\": 38.77,\\n    \\\"establishment_id\\\": {{new_establishment}},\\n    \\\"latitude\\\": -33.01170951430673,\\n    \\\"longitude\\\": -60.770449228584766,\\n    \\\"name\\\": \\\"Plot 1\\\",\\n    \\\"geometry\\\": \\\"{\\\\\\\"type\\\\\\\":\\\\\\\"Polygon\\\\\\\",\\\\\\\"coordinates\\\\\\\":[[[178.89312744140625,-0.3968350154009376],[178.99749755859375,-0.5506383054954145],[179.22821044921875,-0.45176514769114756],[178.89312744140625,-0.3968350154009376]]]}\\\"\\n}\""
'

import requests

url = "https://api.qa.sima.ag/api/v3/third_party/plots"

payload = "\"{\n    \\"area\\": 38.77,\n    \\"establishment_id\\": {{new_establishment}},\n    \\"latitude\\": -33.01170951430673,\n    \\"longitude\\": -60.770449228584766,\n    \\"name\\": \\"Plot 1\\",\n    \\"geometry\\": \\"{\\\\"type\\\\":\\\\"Polygon\\\\",\\\\"coordinates\\\\":[[[178.89312744140625,-0.3968350154009376],[178.99749755859375,-0.5506383054954145],[179.22821044921875,-0.45176514769114756],[178.89312744140625,-0.3968350154009376]]]}\\"\n}\""
headers = {
    "Authorization": "Bearer <token>",
    "X-SIMA-SYSTEM-ID": "<api-key>",
    "Content-Type": "*/*"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    Authorization: 'Bearer <token>',
    'X-SIMA-SYSTEM-ID': '<api-key>',
    'Content-Type': '*/*'
  },
  body: JSON.stringify('"{\n    \"area\": 38.77,\n    \"establishment_id\": {{new_establishment}},\n    \"latitude\": -33.01170951430673,\n    \"longitude\": -60.770449228584766,\n    \"name\": \"Plot 1\",\n    \"geometry\": \"{\\\"type\\\":\\\"Polygon\\\",\\\"coordinates\\\":[[[178.89312744140625,-0.3968350154009376],[178.99749755859375,-0.5506383054954145],[179.22821044921875,-0.45176514769114756],[178.89312744140625,-0.3968350154009376]]]}\"\n}"')
};

fetch('https://api.qa.sima.ag/api/v3/third_party/plots', 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.qa.sima.ag/api/v3/third_party/plots",
  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('"{\\n    \\"area\\": 38.77,\\n    \\"establishment_id\\": {{new_establishment}},\\n    \\"latitude\\": -33.01170951430673,\\n    \\"longitude\\": -60.770449228584766,\\n    \\"name\\": \\"Plot 1\\",\\n    \\"geometry\\": \\"{\\\\\\"type\\\\\\":\\\\\\"Polygon\\\\\\",\\\\\\"coordinates\\\\\\":[[[178.89312744140625,-0.3968350154009376],[178.99749755859375,-0.5506383054954145],[179.22821044921875,-0.45176514769114756],[178.89312744140625,-0.3968350154009376]]]}\\"\\n}"'),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: */*",
    "X-SIMA-SYSTEM-ID: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}