curl --request POST \
  --url https://api.gojinko.com/v1/select_ancillaries \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "trip_id": "trip_1048576",
  "item_id": "itm_4b91c2",
  "selections": [
    {
      "offer_id": "anc_3f9a1c27e4b8d051",
      "traveler_ref": "pax_1",
      "quantity": 1
    },
    {
      "offer_id": "anc_9b04e7d2c6a1f835",
      "traveler_ref": "pax_1",
      "segment_ref_ids": [
        "seg_1"
      ],
      "seat_number": "14A"
    }
  ]
}
'

import requests

url = "https://api.gojinko.com/v1/select_ancillaries"

payload = {
    "trip_id": "trip_1048576",
    "item_id": "itm_4b91c2",
    "selections": [
        {
            "offer_id": "anc_3f9a1c27e4b8d051",
            "traveler_ref": "pax_1",
            "quantity": 1
        },
        {
            "offer_id": "anc_9b04e7d2c6a1f835",
            "traveler_ref": "pax_1",
            "segment_ref_ids": ["seg_1"],
            "seat_number": "14A"
        }
    ]
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    trip_id: 'trip_1048576',
    item_id: 'itm_4b91c2',
    selections: [
      {offer_id: 'anc_3f9a1c27e4b8d051', traveler_ref: 'pax_1', quantity: 1},
      {
        offer_id: 'anc_9b04e7d2c6a1f835',
        traveler_ref: 'pax_1',
        segment_ref_ids: ['seg_1'],
        seat_number: '14A'
      }
    ]
  })
};

fetch('https://api.gojinko.com/v1/select_ancillaries', 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.gojinko.com/v1/select_ancillaries",
  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([
    'trip_id' => 'trip_1048576',
    'item_id' => 'itm_4b91c2',
    'selections' => [
        [
                'offer_id' => 'anc_3f9a1c27e4b8d051',
                'traveler_ref' => 'pax_1',
                'quantity' => 1
        ],
        [
                'offer_id' => 'anc_9b04e7d2c6a1f835',
                'traveler_ref' => 'pax_1',
                'segment_ref_ids' => [
                                'seg_1'
                ],
                'seat_number' => '14A'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-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://api.gojinko.com/v1/select_ancillaries"

	payload := strings.NewReader("{\n  \"trip_id\": \"trip_1048576\",\n  \"item_id\": \"itm_4b91c2\",\n  \"selections\": [\n    {\n      \"offer_id\": \"anc_3f9a1c27e4b8d051\",\n      \"traveler_ref\": \"pax_1\",\n      \"quantity\": 1\n    },\n    {\n      \"offer_id\": \"anc_9b04e7d2c6a1f835\",\n      \"traveler_ref\": \"pax_1\",\n      \"segment_ref_ids\": [\n        \"seg_1\"\n      ],\n      \"seat_number\": \"14A\"\n    }\n  ]\n}")

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

	req.Header.Add("X-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://api.gojinko.com/v1/select_ancillaries")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"trip_id\": \"trip_1048576\",\n  \"item_id\": \"itm_4b91c2\",\n  \"selections\": [\n    {\n      \"offer_id\": \"anc_3f9a1c27e4b8d051\",\n      \"traveler_ref\": \"pax_1\",\n      \"quantity\": 1\n    },\n    {\n      \"offer_id\": \"anc_9b04e7d2c6a1f835\",\n      \"traveler_ref\": \"pax_1\",\n      \"segment_ref_ids\": [\n        \"seg_1\"\n      ],\n      \"seat_number\": \"14A\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gojinko.com/v1/select_ancillaries")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"trip_id\": \"trip_1048576\",\n  \"item_id\": \"itm_4b91c2\",\n  \"selections\": [\n    {\n      \"offer_id\": \"anc_3f9a1c27e4b8d051\",\n      \"traveler_ref\": \"pax_1\",\n      \"quantity\": 1\n    },\n    {\n      \"offer_id\": \"anc_9b04e7d2c6a1f835\",\n      \"traveler_ref\": \"pax_1\",\n      \"segment_ref_ids\": [\n        \"seg_1\"\n      ],\n      \"seat_number\": \"14A\"\n    }\n  ]\n}"

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

{
  "trip_id": "trip_1048576",
  "item_id": "itm_4b91c2",
  "quoted_item_id": 8810231,
  "selected_ancillaries": [
    {
      "offer_id": "anc_3f9a1c27e4b8d051",
      "traveler_ref": "pax_1",
      "pax_ref_id": "pax_1",
      "quantity": 1,
      "type": "seat",
      "seat_number": "14A",
      "segment_ref_ids": [
        "seg_1"
      ],
      "price": {
        "amount": 123,
        "value": 41250,
        "currency": "USD",
        "decimal_places": 2,
        "display": "USD 412.50"
      },
      "price_money": {
        "value": 41250,
        "currency": "USD",
        "decimal_places": 2,
        "display": "USD 412.50"
      },
      "status": "pending",
      "not_charged": true,
      "failure_reason": "<string>"
    }
  ],
  "total_with_ancillaries": {
    "amount": 123,
    "value": 41250,
    "currency": "USD",
    "decimal_places": 2,
    "display": "USD 412.50"
  }
}

{
  "error": {
    "code": "BAD_REQUEST",
    "message": "Malformed JSON in request body.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "AUTH_REQUIRED",
    "message": "Invalid or expired API key.",
    "doc_url": "https://docs.gojinko.com/authentication/api-keys"
  }
}

{
  "error": {
    "code": "PAYMENT_REQUIRED",
    "message": "Insufficient balance — this call costs $0.0150 and your organization has $0.0000 available. Top up at https://dashboard.gojinko.com/developers/billing/topup",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "Resource not found.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "CONFLICT",
    "message": "The operation conflicts with the current state of the resource.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "GONE",
    "message": "The resource no longer exists.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "BAD_REQUEST",
    "message": "A required field is missing or invalid.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "RATE_LIMITED",
    "message": "Too many requests. Retry after the Retry-After delay.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "UPSTREAM_REJECTED",
    "message": "The request was declined for this offer. Try another offer.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "UPSTREAM_UNAVAILABLE",
    "message": "The service is temporarily unavailable. Retry after the Retry-After delay.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}

{
  "error": {
    "code": "UPSTREAM_TIMEOUT",
    "message": "The request timed out before a result was available. Retry the request.",
    "doc_url": "https://docs.gojinko.com/concepts/errors"
  }
}