> ## Documentation Index
> Fetch the complete documentation index at: https://docs.corrily.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Calculate price API examples

> Code examples that demonstrate how Corrily's calculate price API is commonly used.

## Calculate price from server-detected IP address

```js Node.js (Express) theme={null}
const express = require('express');
const app = express();
// Any HTTPS request library that can POST should work.
const axios = require('axios');
const uuidv4 = require('uuid').v4;

app.get('/', async (request, response) => {
   const user_id = uuidv4();
 // Assuming x-forwarded-for is properly configured, this header
 // is an easy way to extract the client's IP address.
 if (!request.headers['x-forwarded-for']) {
   response.json({
   message: 'Error: X-Forwarded-For not found'
 });
 return;
 }
 const ip = request.headers['x-forwarded-for'].split(',')[0];
 const result = await axios({
   // Make sure to POST the request, not GET.
 method: 'POST',
 headers: {
   // Make sure the payload is JSON, not form encoded.
 'Content-Type': 'application/json',
 // See docs.corrily.com/setup
 api_key: 'b82fd0fa-2a1b-4226-b6c0-22884ae97f84'
 },
 data: {
   // See docs.corrily.com/setup
 products: ['monthly', 'annual'],
 ip,
 user_id
 },
 url: 'https://client.corrily.com/v1/prices'
 });
 return response.json(result.data);
});

app.listen(8080, () => {
   console.log(\"Go to the homepage to see Corrily's JSON response\");
});
```

## Calculate price from client's IP address

<Warning>
  <h3>Only works with client-side languages</h3>

  Corrily can only infer the IP address from the request when the request comes directly from the client device. In other words, this use case won't work with server-side languages.
</Warning>

```js JavaScript theme={null}
const headers = new Headers();
// See docs.corrily.com/setup
headers.append("api_key", "b82fd0fa-2a1b-4226-b6c0-22884ae97f84");
// Make sure the payload is JSON, not form encoded.
headers.append("Content-Type", "application/json");

// https://stackoverflow.com/a/2117523
function uuidv4() {
  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, (c) =>
    (
      c ^
      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
    ).toString(16)
  );
}

let data = {
  user_id: uuidv4(),
  get_ip_from_request: true,
  // See docs.corrily.com/setup
  products: ["monthly", "annual"],
};

// Make sure the payload is JSON, not form encoded.
data = JSON.stringify(data);

const options = {
  // Make sure to POST the request, not GET.
  method: "POST",
  headers: headers,
  body: data,
  redirect: "follow",
};

fetch("https://client.corrily.com/v1/prices", options)
  .then((response) => response.json())
  .then((result) => console.log(result))
  .catch((error) => console.error(error));
```

## Calculate price from country code

```python Python theme={null}
# Any HTTPS request library that can POST should work.
import requests
import random
import json
import uuid

url = 'https://client.corrily.com/v1/prices'

headers = {
   # Make sure that the payload is set to JSON, not form encoded.
 'Content-Type': 'application/json',
 # See docs.corrily.com/setup
 'api_key': 'b82fd0fa-2a1b-4226-b6c0-22884ae97f84'
}

data = {
   'user_id': str(uuid.uuid4()),
 # See docs.corrily.com/setup
 'products': [
   'monthly',
 'annual'
 ],
 # When you omit an IP address and provide a country code,
 # Corrily generates a price for the given country.
 'country': 'JP'
}

# Make sure that the payload is set to JSON, not form encoded.
data = json.dumps(data)
# Make sure to POST the request, not GET.
response = requests.request('POST', url, headers=headers, data=data)
print(json.dumps(json.loads(response.text), indent=4))
```

```js JavaScript theme={null}
const headers = new Headers();
// See docs.corrily.com/setup
headers.append("api_key", "b82fd0fa-2a1b-4226-b6c0-22884ae97f84");
// Make sure the payload is JSON, not form encoded.
headers.append("Content-Type", "application/json");

// https://stackoverflow.com/a/2117523
function uuidv4() {
  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, (c) =>
    (
      c ^
      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
    ).toString(16)
  );
}

let data = {
  user_id: uuidv4(),
  // When you omit an IP address and provide a country code,
  // Corrily generates a price for the given country.
  country: "JP",
  // See docs.corrily.com/setup
  products: ["monthly", "annual"],
};

// Make sure the payload is JSON, not form encoded.
data = JSON.stringify(data);

const options = {
  // Make sure to POST the request, not GET.
  method: "POST",
  headers: headers,
  body: data,
  redirect: "follow",
};

fetch("https://client.corrily.com/v1/prices", options)
  .then((response) => response.json())
  .then((result) => console.log(result))
  .catch((error) => console.error(error));
```

```js Node.js theme={null}
// Any HTTPS request library that can POST should work.
const axios = require("axios");
const uuidv4 = require("uuid").v4;

async function calculatePrice() {
  const result = await axios({
    // Make sure to POST the request, not GET.
    method: "POST",
    headers: {
      // Make sure the payload is JSON, ot form encoded.
      "Content-Type": "application/json",
      // See docs.corrily.com/setup
      api_key: "b82fd0fa-2a1b-4226-b6c0-22884ae97f84",
    },
    data: {
      // See docs.corrily.com/setup
      products: ["monthly", "annual"],
      // When you omit an IP address and provide a country code,
      // Corrily generates a price for the given country.
      country: "JP",
      user_id: uuidv4(),
    },
    url: "https://client.corrily.com/v1/prices",
  });
  console.log(result.data);
}

calculatePrice();
```