public/library/Get-PSTSSecureFile.ps1

function Get-PSTSSecureFile
{
    param(
        [Parameter(Mandatory=$true)][string] $project
    )

    process {

        $content = `
        _PSTSAPI `
            -project $project `
            -resource "distributedtask/SecureFiles" `
            -method "GET"

        return [SecureFile[]]$content.value
    }
}