# Transactions

The Transactions API allows you to process and manage card-not-present (CNP) payment transactions.

Use this API to manage the transaction lifecycle, including:

* Authorize payments
* Capture previously authorized transactions
* Process sale transactions
* Issue refunds
* Void transactions

{% hint style="info" %}
All transactions are stored in batches. You can:

* Configure batches for automatic closure using the [Gateway Settings API](/api-reference/api/payments/gateway-settings.md)
* Manage batch closure manually using the [Batches API](/api-reference/api/payments/batches.md)
* Search for batches the [Batches Warehouse API](/api-reference/api/payments/batches-warehouse.md)

For token operations, use the [Vault API](/api-reference/api/payments/cards-card-not-present/vault.md) endpoint.

Other useful links:

* [Card numbers for testing](/api-reference/resources/test-cards-and-ach-accounts.md)
* [Code samples in various languages](https://github.com/clearent/API-Examples)
  {% endhint %}

### Rate limit notice

The API enforces rate limits to ensure system stability. If you exceed the allowed request threshold, the API returns an HTTP `429 Too Many Requests` response.

If you receive a 429 response:

* Wait for the duration specified in the `Retry-After` header, if provided.
* Implement exponential backoff before retrying the request.

For sustained high-volume needs or to obtain detailed limit information, contact your integration specialist.


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