# Rayo SMS SDKs

> Official SDK documentation for integrating applications with the Rayo SMS Gateway API.

- Website: https://www.rayosms.com
- API reference: https://api-docs.rayosms.com
- PHP SDK source: https://github.com/Rayo-SMS/rayo-sms-php-sdk
- API base URL: https://api.rayosms.com/v1
- Webhook signature header: RAYO-SMS-Signature

## Documentation

- [SDK overview](https://sms-sdks-docs.rayosms.com/): Official SDKs for integrating web, backend, and native applications with the Rayo SMS Gateway API.
- [PHP SDK overview](https://sms-sdks-docs.rayosms.com/php/): Use the official Rayo SMS PHP SDK to send and schedule messages, query delivery status, and verify callbacks.
- [Installation & configuration](https://sms-sdks-docs.rayosms.com/php/installation/): Install and configure the Rayo SMS PHP SDK, API credentials, base URL, and HTTP options.
- [Quickstart](https://sms-sdks-docs.rayosms.com/php/quickstart/): Send a simulated SMS with the Rayo SMS PHP SDK without consuming credits.
- [Sending SMS](https://sms-sdks-docs.rayosms.com/php/sending-sms/): Send messages to phone numbers and contact groups with arrays or SmsRequest objects.
- [Scheduling messages](https://sms-sdks-docs.rayosms.com/php/scheduling/): Schedule future SMS delivery and cancel a scheduled request with the PHP SDK.
- [Balance & delivery status](https://sms-sdks-docs.rayosms.com/php/status-and-balance/): Retrieve account credits and inspect SMS delivery status with the PHP SDK.
- [Webhooks](https://sms-sdks-docs.rayosms.com/php/webhooks/): Verify signed Rayo SMS delivery callbacks and parse GET or POST webhook payloads.
- [Error handling](https://sms-sdks-docs.rayosms.com/php/errors/): Handle SDK validation, HTTP, API, and response parsing errors with RayoException.
- [API reference](https://sms-sdks-docs.rayosms.com/php/api-reference/): Reference for the PHP SDK client, request and response models, delivery constants, exceptions, and webhook verifier.