curl --request POST \
  --url https://api.pawpayments.com/api/v2/invoices/{invoice_id}/simulate \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "paid_amount": 1,
  "send_webhook": true,
  "notify_url": "<string>"
}
'

import requests

url = "https://api.pawpayments.com/api/v2/invoices/{invoice_id}/simulate"

payload = {
    "paid_amount": 1,
    "send_webhook": True,
    "notify_url": "<string>"
}
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({paid_amount: 1, send_webhook: true, notify_url: '<string>'})
};

fetch('https://api.pawpayments.com/api/v2/invoices/{invoice_id}/simulate', 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.pawpayments.com/api/v2/invoices/{invoice_id}/simulate",
  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([
    'paid_amount' => 1,
    'send_webhook' => true,
    'notify_url' => '<string>'
  ]),
  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.pawpayments.com/api/v2/invoices/{invoice_id}/simulate"

	payload := strings.NewReader("{\n  \"paid_amount\": 1,\n  \"send_webhook\": true,\n  \"notify_url\": \"<string>\"\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.pawpayments.com/api/v2/invoices/{invoice_id}/simulate")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"paid_amount\": 1,\n  \"send_webhook\": true,\n  \"notify_url\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.pawpayments.com/api/v2/invoices/{invoice_id}/simulate")

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  \"paid_amount\": 1,\n  \"send_webhook\": true,\n  \"notify_url\": \"<string>\"\n}"

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

{
  "ok": true,
  "result": {
    "invoice": {
      "accepted_coins": [
        "usdt_tron",
        "usdc_eth"
      ],
      "address_from": null,
      "address_to": "TXk2Y5...redacted",
      "amount": 49.5,
      "asset": "usdt_tron",
      "billing_type": "fiat",
      "created_at": 1763398800,
      "description": "1 month subscription",
      "excluded_coins": null,
      "expires_at": 1763400600,
      "external_id": "f2c8a3d1-4b7e-4f8a-9c1d-2e3b4a5c6d7e",
      "extra": "order-12345",
      "fee_bearer": "merchant",
      "fiat_amount": 50,
      "fiat_currency": "USD",
      "initial_amount": 49.5,
      "initial_asset": "usdt_tron",
      "initial_fiat_amount": 50,
      "metadata": {
        "customer_id": "u_42"
      },
      "notify_url": "https://shop.example.com/webhook/paw",
      "on_cancel_url": "https://shop.example.com/cancel",
      "on_paid_url": "https://shop.example.com/thanks",
      "order_id": "65f1c3a4e8b1c2d3a4b5c6d7",
      "original_amount": 50,
      "payer_info": null,
      "payment_url": "https://pay.pawpayments.com/checkout/f2c8a3d1-4b7e-4f8a-9c1d-2e3b4a5c6d7e",
      "permanent_address_id": null,
      "price_modifier": -1,
      "processed_at": null,
      "received_amount": 0,
      "status": "created",
      "title": "Premium plan",
      "txid": null,
      "type": "token",
      "underpay_tolerance": 0.01,
      "user_id": null
    },
    "webhook": {
      "delivered": true,
      "error": null,
      "status_code": 200,
      "url": "https://shop.example.com/webhook/paw"
    }
  }
}

{
  "error": {
    "code": "VALIDATION_ERROR",
    "details": [
      {
        "field": "amount",
        "message": "Field required"
      }
    ],
    "message": "Validation failed"
  },
  "ok": false
}

{
  "error": {
    "code": "VALIDATION_ERROR",
    "details": [
      {
        "field": "amount",
        "message": "Field required"
      }
    ],
    "message": "Validation failed"
  },
  "ok": false
}

{
  "error": {
    "code": "VALIDATION_ERROR",
    "details": [
      {
        "field": "amount",
        "message": "Field required"
      }
    ],
    "message": "Validation failed"
  },
  "ok": false
}

{
  "error": {
    "code": "VALIDATION_ERROR",
    "details": [
      {
        "field": "amount",
        "message": "Field required"
      }
    ],
    "message": "Validation failed"
  },
  "ok": false
}