> ## Documentation Index
> Fetch the complete documentation index at: https://next-developers.opencard.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Environments

> Compare OpenCard sandbox and production environments — API base URLs, OAuth token endpoints, signing pages, and registration links for each isolated universe.

|                     | 🧪 Sandbox                                                                   | 🚀 Production                                                |
| ------------------- | ---------------------------------------------------------------------------- | ------------------------------------------------------------ |
| **API base**        | `https://sandbox-api.opencard.io`                                            | `https://api.opencard.io`                                    |
| **Application API** | `.../api/v1/application`                                                     | `.../api/v1/application`                                     |
| **OAuth token**     | `.../oauth/token`                                                            | `.../oauth/token`                                            |
| **Register**        | [sandbox-api.opencard.io/register](https://sandbox-api.opencard.io/register) | [api.opencard.io/register](https://api.opencard.io/register) |
| **Signing pages**   | `sandbox-api.opencard.io/accounts/.../sign/...`                              | `api.opencard.io/accounts/.../sign/...`                      |

Everything is isolated — credentials, data, webhook secrets, signed documents. Separate universes.