# Authentication
{% hint style="success" %}
To ensure secure access, all requests to the Subscription API require an **Authorization** token. This token is unique for each subscription and must be included in the header of every API call. Here's how to authenticate your requests:
{% endhint %}
## **Getting Your Subscription API Token**
After you create a subscription in the Flash web app, a unique **Subscription API token** is automatically generated. You can always retrieve this token from the subscription edit screen. Make sure not to confuse this with the global API token—each subscription has its own token.
***
## **How to Include the Token in Your Requests**
For every API request, the token must be included in the **Authorization** header, formatted as follows:
```graphql
Authorization: Bearer
```
Make sure to replace `` with the actual token you've obtained from the Flash web app.
**Token Example**
Here’s an example of how to structure your Authorization header in a typical API request:
```http
POST https://api.paywithflash.com/v1/get_user_subscription_details
Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cC...
Content-Type: application/x-www-form-urlencoded
```
***
## **Error Handling**
* If the token is **missing** or **invalid**, you will receive a `401 Unauthorized` error.
* For expired tokens, you will get a `Token has expired` message.
### **Common Authentication Errors**
* **401 Unauthorized:** Occurs when the token is invalid, missing, or expired.
* **Invalid Token Format:** Ensure that the token is sent as `Bearer ` and is properly formatted.
## **Sample Request With Authentication**
```bash
curl -X POST https://api.paywithflash.com/v1/get_user_subscription_details \
-H "Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cC..." \
-d "email=user@example.com&flash_id=12345"
```
***
## **Important Notes:**
* Never share your Subscription API token publicly.
* Make sure to use the correct subscription token for each individual subscription.
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