• Source: https://slack.com/
• Icon Support: Yes
• Attachment Support: Yes
• Message Format: Markdown
• Message Limit: 30000 Characters per message

Slack is slightly more complicated then some of the other notification services, so here is quick breakdown of what you need to know and do in order to send Notifications through it using this tool:

First off, Slack notifications require an incoming-webhook it can connect to.

1. You can create this webhook from here. Just follow the wizard to pre-determine the channel(s) you want your message to broadcast to.
2. Or you can create a Slack App here and associate it with one of your Slack Workspaces. From here there are just a few extra steps needed to get your webhook URL (all done through the App's configuration screen):
   • You must Activate the Incoming Webhook Feature if not already.
   • On this same configuration screen, you can create a webhook and assign it to a channel/user.

Regardless of what option you choose (above), both will result in giving you a webhook URL that looks something like this:
https://hooks.slack.com/services/T1JJ3T3L2/A1BRTD4JD/TIiajkdnlazkcOXrIdevi7F

This URL effectively equates to:
https://hooks.slack.com/services/{tokenA}/{tokenB}/{tokenC}

Note: Apprise supports this URL as-is (as of v0.7.7); you no longer need to parse the URL any further. However there is slightly less overhead (internally) if you do.

If you want to convert this to an Apprise URL, do the following: The last part of the URL you're given make up the 3 tokens you need to send notifications with It's very important to pay attention. In the above example the tokens are as follows:

1. TokenA is T1JJ3T3L2
2. TokenB is A1BRTD4JD
3. TokenC is TIiajkdnlazkcOXrIdevi7F8

Bots offer you slightly more flexibility then Webhooks do. The main difference is Slack Bots can support attachments allowing you to leverage this in Apprise!

1. First create your Slack App here.
2. Pick an App Name (such as Apprise) and select your workspace; click on the Create App
3. You'll be able to click on Bots menu selection from here where you can then choose to add a Bot User. Give it a name and then choose *Add Bot User.
4. You'll need to provide the proper OAuth permissions:
   
5. Now choose Install App to which you can choose Install App to Workspace.
6. You will need to authorize the app which you get prompted to do; so this step is easy.
7. Finally you'll get some very important information you will need for Apprise. From this point on you can either used the OAuth Access Token or the Bot User OAuth Access Token using the syntax slack://{OAuth Access Token}.

Your Apprise Slack URL (for accessing your Bot) might look something like:

• slack://xoxp-1234-1234-1234-4ddbc191d40ee098cbaae6f3523ada2d
• slack://xoxb-1234-1234-4ddbc191d40ee098cbaae6f3523ada2d

Both OAuth tokens you are provided have the ability to post text to channels and provide attachments. So it's up to you which of the two you choose to use.

Valid syntaxes are as follows:

• slack://{tokenA}/{tokenB}/{tokenC}
• https://hooks.slack.com/services/{tokenA}/{tokenB}/{tokenC}
• slack://{OAuthToken}/
  • A Bot has no default channel configurable through Slack like Webhooks do. If no channel is specified, then the channel #general is used.

Now if you're using the legacy webhook method (and not going through the App), you're granted a bit more freedom. As a result, the following URLs will also work for you through Apprise:

• slack://{tokenA}/{tokenB}/{tokenC}/#{channel}
• slack://{tokenA}/{tokenB}/{tokenC}/#{channel1}/#{channel2}/#{channelN}
• slack://{OAuthToken}/#{channel}
• slack://{botname}@{OAuthToken}/#{channel1}/#{channel2}/#{channelN}

If you know the Encoded-ID of the channel you wish to access, you can use the plus (+) symbol to identify these separately from channels in the url. Valid syntaxes are as follows:

• slack://{botname}@{tokenA}/{tokenB}/{tokenC}/+{encoded_id}
• slack://{botname}@{tokenA}/{tokenB}/{tokenC}/+{encoded_id1}/+{encoded_id2}/+{encoded_id3}
• slack://{botname}@{OAuthToken}/+{encoded_id}
• slack://{botname}@{OAuthToken}/+{encoded_id1}/+{encoded_id2}/+{encoded_id3}

If you know the user_id you wish to transmit your slack notification to (instead of a channel), you can use the at symbol (@) to do this with. Valid syntaxes are as follows:

• slack://{botname}@{tokenA}/{tokenB}/{tokenC}/@{user_id}
• slack://{botname}@{tokenA}/{tokenB}/{tokenC}/@{user_id1}/@{user_id2}/@{user_id3}
• slack://{botname}@{OAuthToken}/@{user_id}
• slack://{botname}@{OAuthToken}/@{user_id1}/@{user_id2}/@{user_id3}

You can freely mix and match all of the combinations in any order as well:

• slack://**{botname}@{tokenA}/{tokenB}/{tokenC}/@{user_id}/#{channel}/+{encoded_id}
• slack://{botname}@{OAuthToken}/@{user_id}/#{channel}/+{encoded_id}

Send a Slack notification to the channel #nuxref:

# Assuming our {tokenA} is T1JJ3T3L2
# Assuming our {tokenB} is A1BRTD4JD
# Assuming our {tokenC} is TIiajkdnlazkcOXrIdevi7F
# our channel nuxref is represented by #nuxref
apprise -vv -t "Test Message Title" -b "Test Message Body" \
   slack:///T1JJ3T3L2/A1BRTD4JD/TIiajkdnlazkcOXrIdevi7F/#nuxref

Alternatively, if you're using the Bot; a Slack notification sent to the channel #general might look like this:

# Assuming our {OAuthToken} is xoxb-1234-1234-4ddbc191d40ee098cbaae6f3523ada2d
# our channel general is represented by #general
apprise -vv -t "Test Message Title" -b "Test Message Body" \
   slack://xoxb-1234-1234-4ddbc191d40ee098cbaae6f3523ada2d/#general

Perhaps you want to disable the footer, you can do so like so:

# Assuming our {OAuthToken} is xoxb-1234-1234-4ddbc191d40ee098cbaae6f3523ada2d
# we want to send it to our #general channel; %23 is the encoded way of representing the #
# we set footer to no as well
apprise -vv -t "Test Message Title" -b "Test Message Body" \
   slack://xoxb-1234-1234-4ddbc191d40ee098cbaae6f3523ada2d/%23general?footer=no