# PUT /subscription/{{subscription_id}}/update — Update Subscription

> Product: **Pabbly Subscription Billing** (v1)
> Base URL: `https://payments.pabbly.com/api/v1`
> Auth: Basic via `Authorization` header
> Canonical: `/subscription-billing/subscriptions/update-subscription`

Update an existing subscription's attributes — plan, billing cycle, custom fields, status. Send only the fields you want to change.

**Path parameters:**

| Name | Type | Required | Description |
|------|------|----------|-------------|
| subscription_id | string | Yes |  |

**Body parameters:**

| Name | Type | Required | Description |
|------|------|----------|-------------|
| update_reason | string | No | Subscription update reason text. |
| payment_mode | string | No | Possible value will be offline or credit_card. |
| method_id | string | No | If you want to charge from different method, provide payment method id. |
| custom_fields | object | No | Custom fields for the subscription. |
|   ↳ gst_number | string | No |  |
|   ↳ pan_number | string | No |  |

**Example request body:**

```json
{
    "update_reason": "Updating custom fields",
    "payment_mode": "credit_card",
    "method_id": "641d8983995ac04330637994",
    "custom_fields": {
        "gst_number": "GST45788555",
        "pan_number": "PAN785554"
    }
}
```

**Code examples:**

_cURL_

```curl
curl -X PUT https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update \
  -u {{YOUR_API_KEY}}:{{YOUR_SECRET_KEY}} \
  -H "Content-Type: application/json" \
  -d '{
    "update_reason": "Updating custom fields",
    "payment_mode": "credit_card",
    "method_id": "641d8983995ac04330637994",
    "custom_fields": {
      "gst_number": "GST45788555",
      "pan_number": "PAN785554"
    }
  }'
```

_Ruby_

```ruby
require 'net/http'
require 'json'

uri = URI('https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update')
request = Net::HTTP::Put.new(uri)
request.basic_auth '{{YOUR_API_KEY}}', '{{YOUR_SECRET_KEY}}'
request['Content-Type'] = 'application/json'
request.body = "{\"update_reason\":\"Updating custom fields\",\"payment_mode\":\"credit_card\",\"method_id\":\"641d8983995ac04330637994\",\"custom_fields\":{\"gst_number\":\"GST45788555\",\"pan_number\":\"PAN785554\"}}"

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: uri.scheme == 'https') do |http|
  http.request(request)
end

data = JSON.parse(response.body)
```

_Python_

```python
import requests
from requests.auth import HTTPBasicAuth

response = requests.put(
    'https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update',
    auth=HTTPBasicAuth('{{YOUR_API_KEY}}', '{{YOUR_SECRET_KEY}}'),
    json={
    'update_reason': 'Updating custom fields',
    'payment_mode': 'credit_card',
    'method_id': '641d8983995ac04330637994',
    'custom_fields': {
        'gst_number': 'GST45788555',
        'pan_number': 'PAN785554'
    }
},
)

data = response.json()
```

_PHP_

```php
<?php
$ch = curl_init('https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($ch, CURLOPT_USERPWD, '{{YOUR_API_KEY}}:{{YOUR_SECRET_KEY}}');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
curl_setopt($ch, CURLOPT_POSTFIELDS, '{"update_reason":"Updating custom fields","payment_mode":"credit_card","method_id":"641d8983995ac04330637994","custom_fields":{"gst_number":"GST45788555","pan_number":"PAN785554"}}');

$response = curl_exec($ch);
curl_close($ch);
$data = json_decode($response, true);
```

_Java_

```java
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.Base64;

String credentials = Base64.getEncoder().encodeToString("{{YOUR_API_KEY}}:{{YOUR_SECRET_KEY}}".getBytes());

HttpClient client = HttpClient.newHttpClient();
HttpRequest.Builder builder = HttpRequest.newBuilder()
    .uri(URI.create("https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update"))
    .header("Authorization", "Basic " + credentials)
    .header("Content-Type", "application/json")
    .PUT(HttpRequest.BodyPublishers.ofString("{\"update_reason\":\"Updating custom fields\",\"payment_mode\":\"credit_card\",\"method_id\":\"641d8983995ac04330637994\",\"custom_fields\":{\"gst_number\":\"GST45788555\",\"pan_number\":\"PAN785554\"}}"));

HttpRequest request = builder.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());
```

_Node.js_

```node
const credentials = Buffer.from('{{YOUR_API_KEY}}:{{YOUR_SECRET_KEY}}').toString('base64');

const response = await fetch('https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update', {
  method: 'PUT',
  headers: {
    'Authorization': `Basic ${credentials}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "update_reason": "Updating custom fields",
    "payment_mode": "credit_card",
    "method_id": "641d8983995ac04330637994",
    "custom_fields": {
      "gst_number": "GST45788555",
      "pan_number": "PAN785554"
    }
  }),
});

const data = await response.json();
```

_Go_

```go
package main

import (
    "fmt"
    "io"
    "net/http"
    "strings"
)

func main() {
    payload := strings.NewReader("{\"update_reason\":\"Updating custom fields\",\"payment_mode\":\"credit_card\",\"method_id\":\"641d8983995ac04330637994\",\"custom_fields\":{\"gst_number\":\"GST45788555\",\"pan_number\":\"PAN785554\"}}")
    req, _ := http.NewRequest("PUT", "https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update", payload)
    req.Header.Set("Content-Type", "application/json")
    req.SetBasicAuth("{{YOUR_API_KEY}}", "{{YOUR_SECRET_KEY}}")

    res, _ := http.DefaultClient.Do(req)
    defer res.Body.Close()
    body, _ := io.ReadAll(res.Body)
    fmt.Println(string(body))
}
```

_.NET_

```dotnet
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

var credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes("{{YOUR_API_KEY}}:{{YOUR_SECRET_KEY}}"));

var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Put, "https://payments.pabbly.com/api/v1/subscription/{{subscription_id}}/update");
request.Headers.TryAddWithoutValidation("Authorization", $"Basic {credentials}");
request.Content = new StringContent("{\"update_reason\":\"Updating custom fields\",\"payment_mode\":\"credit_card\",\"method_id\":\"641d8983995ac04330637994\",\"custom_fields\":{\"gst_number\":\"GST45788555\",\"pan_number\":\"PAN785554\"}}");
request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

var response = await client.SendAsync(request);
var data = await response.Content.ReadAsStringAsync();
Console.WriteLine(data);
```

---

**Other endpoints in Subscriptions:**

- [POST /subscription/{{customer_id}} — Create Subscription For Existing Customer](/subscription-billing/subscriptions/create-subscription-for-existing-customer)
- [POST /subscription/{{subscription_id}}/cancel — Cancel Subscription For Existing Customer](/subscription-billing/subscriptions/cancel-subscription-for-existing-customer)
- [GET /subscription/{{subscription_id}} — Get Single Subscription](/subscription-billing/subscriptions/get-single-subscription)
- [GET /subscriptions/{{customer_id}} — List All Subscriptions By Customer Id](/subscription-billing/subscriptions/list-all-subscriptions-by-customer-id)
- [GET /subscriptions — List All Subscriptions](/subscription-billing/subscriptions/list-all-subscriptions)
- [GET /scheduledchanges/{{suscription_id}} — Get Scheduled Subscription](/subscription-billing/subscriptions/get-scheduled-subscription)
- [PUT /subscription/{{subscription_id}}/upgrade-downgrade — Upgrade Downgrade Subscription](/subscription-billing/subscriptions/upgrade-downgrade-subscription)
- [POST /subscription/{{subscription_id}}/update_charges — Subscription Update Charges](/subscription-billing/subscriptions/subscription-update-charges)
- [DELETE /subscriptions/{{subscription_id}} — Delete Subscription](/subscription-billing/subscriptions/delete-subscription)
- [PUT /subscription/change-billing/{{subscription_id}} — Change Subscription Billing Date](/subscription-billing/subscriptions/change-subscription-billing-date)
- [PUT /subscription/{{subscription_id}}/pause — Pause Subscription](/subscription-billing/subscriptions/pause-subscription)
- [PUT /subscription/{{subscription_id}}/resume — Resume Subscription](/subscription-billing/subscriptions/resume-subscription)