I've just released a new version of the Pinboard Poster for Kotlin/Java.

Version 0.9.2 adds the ability to set the Pinboard authentication token using a local property or environment variable.

Local Properties

# local.properties
PINBOARD_API_TOKEN=user:TOKEN

val properties = Properties().apply { FileInputStream("local.properties").use { fis -> load(fis) } }
val poster = PinboardPoster(properties)

Environment Variable

export PINBOARD_API_TOKEN="user:TOKEN"

val poster = PinboardPoster()

As usual documentation and source are on GitHub.