# Plugin settings
The credentials live centrally in the plugin, not on the individual element. You find them under *System → Plugins* in the entry *System - Backlinkseller*.
## Backlinkseller ID
Your ID from [backlinkseller.de](https://www.backlinkseller.de/?referrer=542949815), for example `123456789.987654321`. You find it in your Backlinkseller account. **Without it the element delivers nothing** — in debug mode a corresponding notice appears, in normal operation the slot simply stays empty.
Only digits and dots are accepted; everything else is discarded before the request.
## Page URL (optional)
Backlinkseller assigns the links to a page address. Leave the field **empty** and the extension reports the address actually being requested — that is the normal case and right for most websites.
Enter a fixed address here only if all advertising slots are to be assigned to the same address regardless of the page being viewed.
A fixed address applies to the whole website. If you place the element on several pages, they all report the same address to Backlinkseller — and receive the same links.
## Backlinkseller channel
The channel determines which server the request goes to: `channel1` through `channel9`. The default is `channel4`. Change the value only if Backlinkseller explicitly asks you to.
## Cache time (seconds)
How long an answer once fetched is reused before asking again. Default: **300 seconds** (5 minutes), permitted are 0 to 3600.
- **Higher value:** fewer requests, faster page build, but changes at Backlinkseller take effect later.
- **0:** switches the cache off. Then *every* page view asks again. Useful for testing only — in production it costs noticeable time.
The cache is shared by all visitors, not kept per visitor. It is keyed by ID, page address and channel.
## Debug mode
Shows the unprocessed answer of the service in the element, the entries derived from it and any error messages. **It also switches the cache off.**
Switch it on for testing only, and off again afterwards. In debug mode visitors see technical output, and every page view triggers a request of its own.
## What the element itself brings along
Everything to do with appearance — list type, bullets, columns, text style, link style, separator — is set on the element in the builder, not here. See [Using the element in the builder](https://docs.graup-it.de/books/backlinkseller-en/page/using-the-element-in-the-builder).
Applies to version 2.7.5.
[Deutsche Fassung](https://docs.graup-it.de/link/132)