curl --request GET \
  --url https://collectwiseapi.com/payments \
  --header 'collectwise_key: <api-key>'

import requests

url = "https://collectwiseapi.com/payments"

headers = {"collectwise_key": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {collectwise_key: '<api-key>'}};

fetch('https://collectwiseapi.com/payments', 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://collectwiseapi.com/payments",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "collectwise_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"
	"net/http"
	"io"
)

func main() {

	url := "https://collectwiseapi.com/payments"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("collectwise_key", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://collectwiseapi.com/payments")
  .header("collectwise_key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://collectwiseapi.com/payments")

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

request = Net::HTTP::Get.new(url)
request["collectwise_key"] = '<api-key>'

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

{
  "object": "list.payments",
  "period": {
    "start_date": "2026-06-18",
    "end_date": "2026-06-18"
  },
  "pagination": {
    "limit": 50,
    "has_more": false,
    "next_cursor": null
  },
  "count": 1,
  "payments": [
    {
      "id": "pi_3RxT81GhIJk2LmNo",
      "object": "payment",
      "debtor_id": "ACC482910",
      "client_name": "Sunrise Medical Group",
      "call_id": "call_9f2ab61c3d",
      "amount": 245.16,
      "currency": "usd",
      "processor": "stripe",
      "payment_type": "flat",
      "payment_method": "CARD",
      "status": "success",
      "transaction_id": "ch_3RxT81GhIJk2LmNo",
      "phone": "+15555550123",
      "recurrence_rule": null,
      "total_installments": null,
      "next_payment_date": null,
      "created_at": "2026-06-18T14:22:07.318Z"
    }
  ]
}

{
  "error": {
    "type": "invalid_request_error",
    "message": "start_date is required and must be YYYY-MM-DD or a full ISO 8601 UTC timestamp (e.g. 2026-06-18T04:00:00Z)",
    "param": "start_date"
  }
}

{
  "error": {
    "type": "invalid_request_error",
    "message": "start_date is required and must be YYYY-MM-DD or a full ISO 8601 UTC timestamp (e.g. 2026-06-18T04:00:00Z)",
    "param": "start_date"
  }
}

{
  "error": "Forbidden: Invalid API Key - Contact CollectWise Support for Assistance"
}

{
  "error": {
    "type": "invalid_request_error",
    "message": "start_date is required and must be YYYY-MM-DD or a full ISO 8601 UTC timestamp (e.g. 2026-06-18T04:00:00Z)",
    "param": "start_date"
  }
}