curl --request POST \
  --url https://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "transactions": [
    {
      "account_id": "checking_account_202348",
      "amount": -42.42,
      "currency": "USD",
      "description": "GOOGLE *ADS12340929 [email protected] US",
      "reference_id": "my_favourite_transaction_231098",
      "balance": 423,
      "categories_default": "shopping",
      "date": "2020-04-27",
      "mcc_code": "<string>",
      "order": 123,
      "timestamp": "2021-11-12T10:38:05Z",
      "transaction_code": "card"
    }
  ],
  "balances": [
    {
      "account_id": "checking_account_202348",
      "batch_closing_balance": 25000.45
    }
  ]
}
'

import requests

url = "https://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions"

payload = {
    "transactions": [
        {
            "account_id": "checking_account_202348",
            "amount": -42.42,
            "currency": "USD",
            "description": "GOOGLE *ADS12340929 [email protected] US",
            "reference_id": "my_favourite_transaction_231098",
            "balance": 423,
            "categories_default": "shopping",
            "date": "2020-04-27",
            "mcc_code": "<string>",
            "order": 123,
            "timestamp": "2021-11-12T10:38:05Z",
            "transaction_code": "card"
        }
    ],
    "balances": [
        {
            "account_id": "checking_account_202348",
            "batch_closing_balance": 25000.45
        }
    ]
}
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({
    transactions: [
      {
        account_id: 'checking_account_202348',
        amount: -42.42,
        currency: 'USD',
        description: 'GOOGLE *ADS12340929 [email protected] US',
        reference_id: 'my_favourite_transaction_231098',
        balance: 423,
        categories_default: 'shopping',
        date: '2020-04-27',
        mcc_code: '<string>',
        order: 123,
        timestamp: '2021-11-12T10:38:05Z',
        transaction_code: 'card'
      }
    ],
    balances: [{account_id: 'checking_account_202348', batch_closing_balance: 25000.45}]
  })
};

fetch('https://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions', 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://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions",
  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([
    'transactions' => [
        [
                'account_id' => 'checking_account_202348',
                'amount' => -42.42,
                'currency' => 'USD',
                'description' => 'GOOGLE *ADS12340929 [email protected] US',
                'reference_id' => 'my_favourite_transaction_231098',
                'balance' => 423,
                'categories_default' => 'shopping',
                'date' => '2020-04-27',
                'mcc_code' => '<string>',
                'order' => 123,
                'timestamp' => '2021-11-12T10:38:05Z',
                'transaction_code' => 'card'
        ]
    ],
    'balances' => [
        [
                'account_id' => 'checking_account_202348',
                'batch_closing_balance' => 25000.45
        ]
    ]
  ]),
  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://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions"

	payload := strings.NewReader("{\n  \"transactions\": [\n    {\n      \"account_id\": \"checking_account_202348\",\n      \"amount\": -42.42,\n      \"currency\": \"USD\",\n      \"description\": \"GOOGLE *ADS12340929 [email protected] US\",\n      \"reference_id\": \"my_favourite_transaction_231098\",\n      \"balance\": 423,\n      \"categories_default\": \"shopping\",\n      \"date\": \"2020-04-27\",\n      \"mcc_code\": \"<string>\",\n      \"order\": 123,\n      \"timestamp\": \"2021-11-12T10:38:05Z\",\n      \"transaction_code\": \"card\"\n    }\n  ],\n  \"balances\": [\n    {\n      \"account_id\": \"checking_account_202348\",\n      \"batch_closing_balance\": 25000.45\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://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"transactions\": [\n    {\n      \"account_id\": \"checking_account_202348\",\n      \"amount\": -42.42,\n      \"currency\": \"USD\",\n      \"description\": \"GOOGLE *ADS12340929 [email protected] US\",\n      \"reference_id\": \"my_favourite_transaction_231098\",\n      \"balance\": 423,\n      \"categories_default\": \"shopping\",\n      \"date\": \"2020-04-27\",\n      \"mcc_code\": \"<string>\",\n      \"order\": 123,\n      \"timestamp\": \"2021-11-12T10:38:05Z\",\n      \"transaction_code\": \"card\"\n    }\n  ],\n  \"balances\": [\n    {\n      \"account_id\": \"checking_account_202348\",\n      \"batch_closing_balance\": 25000.45\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions")

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  \"transactions\": [\n    {\n      \"account_id\": \"checking_account_202348\",\n      \"amount\": -42.42,\n      \"currency\": \"USD\",\n      \"description\": \"GOOGLE *ADS12340929 [email protected] US\",\n      \"reference_id\": \"my_favourite_transaction_231098\",\n      \"balance\": 423,\n      \"categories_default\": \"shopping\",\n      \"date\": \"2020-04-27\",\n      \"mcc_code\": \"<string>\",\n      \"order\": 123,\n      \"timestamp\": \"2021-11-12T10:38:05Z\",\n      \"transaction_code\": \"card\"\n    }\n  ],\n  \"balances\": [\n    {\n      \"account_id\": \"checking_account_202348\",\n      \"batch_closing_balance\": 25000.45\n    }\n  ]\n}"

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

{
  "request_id": "<string>",
  "transactions_loaded": 123
}