Search along LineString or polygon

I am trying to find POIs along a LineString or within a polygon.

My question with regards to the following string:

request.httpBody = String("{“request”:“pois”,“geometry”:{“geojson”:{“type”:“LineString”,“coordinates”:[[8.8034,53.0756],[8.7834,53.0456]]},“buffer”:200},“limit”:200,“filters”:{“category_ids”:[108]}}").data(using: .utf8)

Is “buffer” a distance in meters around the polyline?

This is the explanation given in the examples:

The geometry object which is a geojson or a bounding box object, optionally buffered.

What does “buffer” mean in a polygon request?

Thank you.

Thank you.

buffer has the same meaning here as in any geospatial software: