# Activate Subscription

```
POST 
/subscriptions/:id/activate
```

Activates a subscription by attaching a payment method and initiating the billing cycle.

**Activation Process**:

1. This endpoint transitions a `PENDING` subscription to `ACTIVE` status

2. An initial payment is created to validate the payment method:

   <!-- -->

   * For regular subscriptions: First billing cycle payment is processed immediately
   * For trial subscriptions: A zero-amount payment is created to verify the payment method

**Payment Method Updates**: If the subscription is already active, this endpoint can be used to update the payment method. The update process creates a zero-amount payment to verify the new payment method works correctly.

**Important Notes**:

* Subscription billing begins immediately upon successful activation (unless in trial period)
* The payment method provided will be used for all future recurring charges
* Activation failures (due to invalid payment method) will keep the subscription in `PENDING` status
* You can specify `allowedPaymentMethods` to restrict which payment methods (e.g., `card`, `bizum`) are accepted for the subscription

## Request[​](#request "Direct link to request")

## Responses[​](#responses "Direct link to Responses")

* 200
* 400
* 401
* 404
* 422
* 500
* 503

A payment object

The request is incorrect or could not be processed

Unauthorized error. Please check your auth credentials

The specified resource was not found

The request was well-formed but could not be processed due to semantic errors

Unexpected server error

The service is temporarily unavailable