# Introduction

## **Paylayercore Payment Gateway API**

Paylayercore provides a comprehensive payment gateway solution for its users. This API offers all RESTful APIs and also provides a user-friendly proprietary extension API.

The Paylayercore API service features low latency, high consistency, high availability, and partition fault tolerance. The Paylayercore API service is available for both the mainnet and testnet. Therefore, ensure you choose the appropriate network according to your needs before using the Paylayercore API service.

**Network Selection**

<table><thead><tr><th width="240">NETWORK</th><th>URL</th></tr></thead><tbody><tr><td>Production Env.</td><td><a href="https://link.paylayercore.com">https://link.paylayercore.com</a></td></tr><tr><td>Test Env.</td><td><a href="https://testlink.paylayercore.com">https://testlink.paylayercore.com</a></td></tr></tbody></table>

To ensure the reasonable allocation of requested resources, all API requests need to carry the API Key parameter. Requests without an API Key will be severely limited or not responded to at all. For details, please refer to the API Key section.


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