Sonarr Pushbullet custom script derived from https://github.com/CJPCNZ/CustomPush/blob/master/Sonarr/PushBullet.ps1 using environment variables from https://wiki.servarr.com/sonarr/custom-scripts

SonarrPushBullet.ps1

# Define Variables
$sonarr_eventtype = $env:sonarr_eventtype
$sonarr_series_id = $env:sonarr_series_id
$sonarr_series_title = $env:sonarr_series_title

$pushkey="" # Your PushBullet API key
$pushtag="" # Add the tag for your Pushbullet Channel or leave blank for direct push notifications

$pushtitle = "Error"
$pushmessage = "Unhandled event type: $sonarr_eventtype"

switch ($sonarr_eventtype)
{
    "Test" {
        # Format content
        $pushtitle = "Test"
        $pushmessage = "Sonarr Test Message"
    }
    "Grab" {
        # Grab variables
        $sonarr_series_type = $env:sonarr_series_type
        $sonarr_release_seasonnumber = $env:sonarr_release_seasonnumber
        $sonarr_release_episodenumbers = $env:sonarr_release_episodenumbers
        $sonarr_release_absoluteepisodenumbers = $env:sonarr_release_absoluteepisodenumbers
        $sonarr_release_episodeairdates = $env:sonarr_release_episodeairdates
        $sonarr_release_episodetitles = $env:sonarr_release_episodetitles
        $sonarr_release_title = $env:sonarr_release_title
        $sonarr_release_quality = $env:sonarr_release_quality
        $sonarr_release_size = $env:sonarr_release_size

        # Format content
        switch ($sonarr_series_type)
        {
            "Anime" {
                $pushtitle = "{0} - Grab: S{1:d2}E{2:d2} ({3})" -f $sonarr_series_title,[int]$sonarr_release_seasonnumber,[int]$sonarr_release_episodenumbers,$sonarr_release_absoluteepisodenumbers
                $pushmessage = "S{0:d2}E{1:d2} ({2}) - {3} - {4}`n{5} ({6:n0} MB)" -f [int]$sonarr_release_seasonnumber,[int]$sonarr_release_episodenumbers,$sonarr_release_absoluteepisodenumbers,$sonarr_release_quality,$sonarr_release_episodetitles,$sonarr_release_title,([int64]$sonarr_release_size/1MB)
            }
            "Daily" {
                $pushtitle = "{0} - Grab: S{1:d2}E{2:d2} ({3})" -f $sonarr_series_title,[int]$sonarr_release_seasonnumber,[int]$sonarr_release_episodenumbers,$sonarr_release_episodeairdates
                $pushmessage = "S{0:d2}E{1:d2} ({2}) - {3} - {4}`n{5} ({6:n0} MB)" -f [int]$sonarr_release_seasonnumber,[int]$sonarr_release_episodenumbers,$sonarr_release_episodeairdates,$sonarr_release_quality,$sonarr_release_episodetitles,$sonarr_release_title,([int64]$sonarr_release_size/1MB)
            }
            Default {
                $pushtitle = "{0} - Grab: S{1:d2}E{2:d2}" -f $sonarr_series_title,[int]$sonarr_release_seasonnumber,[int]$sonarr_release_episodenumbers
                $pushmessage = "S{0:d2}E{1:d2} - {2} - {3}`n{4} ({5:n0} MB)" -f [int]$sonarr_release_seasonnumber,[int]$sonarr_release_episodenumbers,$sonarr_release_quality,$sonarr_release_episodetitles,$sonarr_release_title,([int64]$sonarr_release_size/1MB)
            }
        }
    }
    "Download" {
        # Download Variables
        $sonarr_episodefile_id = $env:sonarr_episodefile_id
        $sonarr_episodefile_seasonnumber = $env:sonarr_episodefile_seasonnumber
        $sonarr_episodefile_episodenumbers = $env:sonarr_episodefile_episodenumbers
        $sonarr_episodefile_episodetitles = $env:sonarr_episodefile_episodetitles
        $sonarr_episodefile_quality = $env:sonarr_episodefile_quality

        # Format content
        $pushtitle = "{0} - Import: S{1:d2}E{2:d2}" -f $sonarr_series_title,[int]$sonarr_episodefile_seasonnumber,[int]$sonarr_episodefile_episodenumbers
        $pushmessage = "S{0:d2}E{1:d2} - {2} - {3}" -f [int]$sonarr_episodefile_seasonnumber,[int]$sonarr_episodefile_episodenumbers,$sonarr_episodefile_quality,$sonarr_episodefile_episodetitles
    }
    "Rename" {
        # Rename Variables
        $sonarr_series_path = $env:sonarr_series_path

        # Format content
        $pushtitle = "{0} - Rename" -f $sonarr_series_title
        $pushmessage = "{0}" -f $sonarr_series_path
    }
    "EpisodeDeleted" {
        # EpisodeDeleted Variables
        $sonarr_episodefile_id = $env:sonarr_episodefile_id
        $sonarr_episodefile_seasonnumber = $env:sonarr_episodefile_seasonnumber
        $sonarr_episodefile_episodenumbers = $env:sonarr_episodefile_episodenumbers
        $sonarr_episodefile_episodetitles = $env:sonarr_episodefile_episodetitles
        $sonarr_episodefile_quality = $env:sonarr_episodefile_quality

        # Format content
        $pushtitle = "{0} - Episode Deleted: S{1:d2}E{2:d2}" -f $sonarr_series_title,[int]$sonarr_episodefile_seasonnumber,[int]$sonarr_episodefile_episodenumbers
        $pushmessage = "S{0:d2}E{1:d2} - {2} - {3}" -f [int]$sonarr_episodefile_seasonnumber,[int]$sonarr_episodefile_episodenumbers,$sonarr_episodefile_quality,$sonarr_episodefile_episodetitles
    }
    "SeriesDeleted" {
        # SeriesDeleted Variables
        $sonarr_series_path = $env:sonarr_series_path
        $sonarr_series_deletedfiles - $sonarr_series_deletedfiles

        # Format content
        $pushtitle = "{0} - Series Deleted" -f $sonarr_series_title
        $pushmessage = "{0}`nFiles deleted: {1}" -f $sonarr_series_path,$sonarr_series_deletedfiles
    }
    "HealthIssue" {
        # Health Variables
        $sonarr_health_issue_level = $env:sonarr_health_issue_level
        $sonarr_health_issue_type = $env:sonarr_health_issue_type
        $sonarr_health_issue_message = $env:sonarr_health_issue_message
        $sonarr_health_issue_wiki = $env:sonarr_health_issue_wiki

        # Format content
        $pushtitle = "{0} Health Issue - {1}" -f $sonarr_health_issue_type,$sonarr_health_issue_level
        $pushmessage = "{0}" -f $sonarr_health_issue_message
        if (![string]::IsNullOrWhiteSpace($sonarr_health_issue_wiki)) {
            $pushmessage += "`n{0}" -f $sonarr_health_issue_wiki
        }
    }
}

# Prepare push notification body
$pushbody = @{
    type = 'note'
    "title" = $pushtitle
    "body" = $pushmessage
    channel_tag = $pushtag
}

# Send push notification
Invoke-WebRequest -Method POST -Uri "https://api.pushbullet.com/v2/pushes" -UseBasicParsing -Header @{"Access-Token" = $pushkey} -Body $pushBody