> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pasca.name.ng/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

> Pass your PASCA credentials on every request

## Required headers

PASCA authenticates requests using API keys and secrets. The collection defines two header pairs, and each endpoint lists the exact headers it expects.

* `API-KEY` and `API-SECRET`

Include `Accept: application/json` unless the endpoint explicitly returns XML.

## Playground usage

When you use the API playground in the Reference tab, paste your own credentials into the auth fields. Do not commit real keys to documentation files.

## Example

```bash theme={null}
curl -X GET "https://api.pasca.co/api/v1/einvoice/resources/currencies" \
  -H "API-KEY: <your_api_key>" \
  -H "API-SECRET: <your_api_secret>" \
  -H "Accept: application/json"
```

## Environment variables

* `BASE_URL`: Your PASCA API base URL
* `API_KEY`: Your API key
* `API_SECRET`: Your API secret
* `BUSINESS_ID`: Your NRS business\_id
* `IRN`: An invoice reference number for testing