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

# File Transfer Token Replacement

> Replace tokens with card data in SFTP/FTPS file transfers. PCI Booking acts as secure proxy for batch file processing.

File Transfer Token Replacement lets you deliver card data to partners via SFTP or FTPS. You upload a file containing card tokens to PCI Booking, which replaces the tokens with real card data and sends the file to the destination server.

## How It Works

1. Your system sends a PUT request to PCI Booking's SFTP/FTPS relay endpoint, providing the destination host, file path, server credentials, and the file content with card tokens.
2. PCI Booking applies a content filter to locate tokens in the file, retrieves the real card data, and substitutes it.
3. The modified file, now containing real card data, is uploaded to the destination SFTP or FTPS server.

## Supported File Formats

PCI Booking supports several preset content filters for common file formats:

| Filter     | Description                        |
| ---------- | ---------------------------------- |
| CSV        | Standard comma-separated values.   |
| SIMPLECSV  | Simplified CSV layout.             |
| SIMPLEJSON | JSON file format.                  |
| TADC       | Travel agent data capture format.  |
| GBT        | Global distribution system format. |
| AIR        | Airline industry format.           |
| IUR        | GDS interchange format.            |

## Authentication

Destination server credentials (username and password) are passed via the HTTP Basic Authorization header on your relay request. PCI Booking uses these credentials to connect to the destination SFTP or FTPS server. Card tokens are specified in the `X-PciBooking-cardUri` request header.

<Info>
  The reverse operation is also available: you can download a file from an SFTP/FTPS server through PCI Booking, which tokenizes any card data found in the file before returning it to your system. See [File Transfer Tokenization](/capture-cards/file-transfer-tokenization).
</Info>

## Next Steps

<CardGroup cols={2}>
  <Card title="Token Replacement in Request" icon="book" href="/use-tokens/token-replacement-in-request">
    Send card data via HTTP proxy instead.
  </Card>

  <Card title="Use Tokens Overview" icon="book" href="/use-tokens/overview">
    All detokenization methods.
  </Card>
</CardGroup>