diff --git a/forms-bridge/addons/gsheets/hooks.php b/forms-bridge/addons/gsheets/hooks.php
index 58f0b689..1bc263d5 100644
--- a/forms-bridge/addons/gsheets/hooks.php
+++ b/forms-bridge/addons/gsheets/hooks.php
@@ -87,8 +87,7 @@ function ( $defaults, $addon, $schema ) {
 						'name'     => 'scope',
 						'label'    => __( 'Scope', 'forms-bridge' ),
 						'type'     => 'text',
-						'value'    =>
-							'https://www.googleapis.com/auth/drive.readonly https://www.googleapis.com/auth/spreadsheets',
+						'value'    => 'https://www.googleapis.com/auth/drive.readonly https://www.googleapis.com/auth/spreadsheets',
 						'required' => true,
 					),
 					array(
@@ -147,8 +146,7 @@ function ( $defaults, $addon, $schema ) {
 					'name'          => '',
 					'schema'        => 'Bearer',
 					'oauth_url'     => 'https://accounts.google.com/o/oauth2/v2',
-					'scope'         =>
-						'https://www.googleapis.com/auth/drive.readonly https://www.googleapis.com/auth/spreadsheets',
+					'scope'         => 'https://www.googleapis.com/auth/drive.readonly https://www.googleapis.com/auth/spreadsheets',
 					'client_id'     => '',
 					'client_secret' => '',
 					'access_token'  => '',
@@ -173,8 +171,7 @@ function ( $data, $template_id ) {
 			return $data;
 		}
 
-		$data['bridge']['endpoint'] =
-			'/v4/spreadsheets/' . $data['bridge']['endpoint'];
+		$data['bridge']['endpoint'] = '/v4/spreadsheets/' . $data['bridge']['endpoint'];
 		return $data;
 	},
 	10,
@@ -184,7 +181,7 @@ function ( $data, $template_id ) {
 add_filter(
 	'http_bridge_oauth_url',
 	function ( $url, $verb ) {
-		if ( strpos( $url, 'accounts.google.com' ) === false ) {
+		if ( false === strpos( $url, 'accounts.google.com' ) ) {
 			return $url;
 		}
 
diff --git a/forms-bridge/addons/slack/assets/logo.png b/forms-bridge/addons/slack/assets/logo.png
new file mode 100644
index 00000000..03fb1f13
Binary files /dev/null and b/forms-bridge/addons/slack/assets/logo.png differ
diff --git a/forms-bridge/addons/slack/class-slack-addon.php b/forms-bridge/addons/slack/class-slack-addon.php
new file mode 100644
index 00000000..2eae6177
--- /dev/null
+++ b/forms-bridge/addons/slack/class-slack-addon.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * Class Slack_Addon
+ *
+ * @package formsbridge
+ */
+
+namespace FORMS_BRIDGE;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit();
+}
+
+require_once 'class-slack-form-bridge.php';
+require_once 'hooks.php';
+
+/**
+ * Slack addon class.
+ */
+class Slack_Addon extends Addon {
+	/**
+	 * Holds the addon's title.
+	 *
+	 * @var string
+	 */
+	public const TITLE = 'Slack';
+
+	/**
+	 * Holds the addon's name.
+	 *
+	 * @var string
+	 */
+	public const NAME = 'slack';
+
+	/**
+	 * Holds the addon's custom bridge class.
+	 *
+	 * @var string
+	 */
+	public const BRIDGE = '\FORMS_BRIDGE\Slack_Form_Bridge';
+
+	/**
+	 * Performs a request against the backend to check the connexion status.
+	 *
+	 * @param string $backend Backend name.
+	 *
+	 * @return boolean
+	 */
+	public function ping( $backend ) {
+		$bridge = new Slack_Form_Bridge(
+			array(
+				'name'     => '__slack-' . time(),
+				'endpoint' => '/api/conversations.list',
+				'method'   => 'GET',
+				'backend'  => $backend,
+			)
+		);
+
+		$response = $bridge->submit();
+
+		if ( is_wp_error( $response ) ) {
+			Logger::log( 'Slack backend ping error response', Logger::ERROR );
+			Logger::log( $response, Logger::ERROR );
+			return false;
+		}
+
+		return true;
+	}
+
+	/**
+	 * Performs a GET request against the backend endpoint and retrive the response data.
+	 *
+	 * @param string $endpoint API endpoint.
+	 * @param string $backend Backend name.
+	 *
+	 * @return array|WP_Error
+	 */
+	public function fetch( $endpoint, $backend ) {
+		$bridge = new Slack_Form_Bridge(
+			array(
+				'name'     => '__slack-' . time(),
+				'endpoint' => $endpoint,
+				'method'   => 'GET',
+				'backend'  => $backend,
+			),
+			'zulip'
+		);
+
+		return $bridge->submit();
+	}
+}
+
+Slack_Addon::setup();
diff --git a/forms-bridge/addons/slack/class-slack-form-bridge.php b/forms-bridge/addons/slack/class-slack-form-bridge.php
new file mode 100644
index 00000000..dc9fb18d
--- /dev/null
+++ b/forms-bridge/addons/slack/class-slack-form-bridge.php
@@ -0,0 +1,153 @@
+<?php
+/**
+ * Class Slack_Form_Bridge
+ *
+ * @package formsbridge
+ */
+
+namespace FORMS_BRIDGE;
+
+use FBAPI;
+use WP_Error;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit();
+}
+
+/**
+ * Form bridge implementation for the Slack API.
+ */
+class Slack_Form_Bridge extends Form_Bridge {
+	/**
+	 * Holdes the current HTTP request.
+	 *
+	 * @var array|null
+	 */
+	private static $request;
+
+	/**
+	 * Submits payload and attachments to the bridge's backend.
+	 *
+	 * @param array $payload Payload data.
+	 * @param array $attachments Submission's attached files.
+	 *
+	 * @return array|WP_Error Http request response.
+	 */
+	public function submit( $payload = array(), $attachments = array() ) {
+		$uploads = FBAPI::get_uploads();
+
+		if ( ! empty( $uploads ) ) {
+			$attachments = Forms_Bridge::attachments( $uploads );
+			$backend     = $this->backend();
+
+			foreach ( $attachments as $name => $path ) {
+				$info     = pathinfo( $path );
+				$filename = $info['basename'];
+
+				$response = $backend->post(
+					'/api/files.getUploadURLExternal',
+					array(
+						'length'   => filesize( $path ),
+						'filename' => $filename,
+					),
+					array(
+						'Content-Type' => 'application/x-www-form-urlencoded',
+					)
+				);
+
+				if ( is_wp_error( $response ) ) {
+					return $response;
+				}
+
+				if ( isset( $response['data']['error'] ) ) {
+					return new WP_Error( 'slack_upload', __( 'Can not upload a file to Slack', 'forms-bridge' ), $response['data'] );
+				}
+
+				$file_id    = $response['data']['file_id'];
+				$upload_url = $response['data']['upload_url'];
+
+				$response = http_bridge_post(
+					$upload_url,
+					file_get_contents( $path ),
+					array(
+						'Content-Type' => 'application/octet-stream',
+					),
+				);
+
+				if ( is_wp_error( $response ) ) {
+					return $response;
+				}
+
+				$attachments[ $name ] = $file_id;
+			}
+
+			$files = array();
+			foreach ( $attachments as $name => $file_id ) {
+				$files[] = array(
+					'id'    => $file_id,
+					'title' => $name,
+				);
+			}
+
+			$response = $backend->post(
+				'/api/files.completeUploadExternal',
+				array(
+					'files'      => wp_json_encode( $files ),
+					'channel_id' => $payload['channel'] ?? $payload['channel_id'] ?? null,
+				),
+				array(
+					'Content-Type' => 'application/x-www-form-urlencoded',
+				),
+			);
+
+			if ( is_wp_error( $response ) ) {
+				return $response;
+			}
+
+			if ( isset( $response['data']['error'] ) ) {
+				return new WP_Error( 'slack_upload', __( 'Can not upload a file to Slack', 'forms-bridge' ), $response['data'] );
+			}
+
+			$annex = "\n\n----\n" . esc_html( __( 'Attachments', 'forms-bridge' ) ) . ":\n";
+
+			foreach ( $response['data']['files'] as $upload ) {
+				$annex .= "* [{$upload['name']}]({$upload['permalink']})\n";
+			}
+
+			if ( isset( $payload['markdown_text'] ) ) {
+				$payload['markdown_text'] .= $annex;
+			} else {
+				$payload['text'] .= $annex;
+			}
+		}
+
+		add_filter(
+			'http_bridge_request',
+			static function ( $request ) {
+				self::$request = $request;
+				return $request;
+			},
+			10,
+			1
+		);
+
+		$response = parent::submit( $payload, array() );
+
+		if ( is_wp_error( $response ) ) {
+			return $response;
+		}
+
+		if ( isset( $response['data']['error'] ) ) {
+			return new WP_Error(
+				'slack_rpc_error',
+				'Slack bridge response error',
+				array(
+					'request'  => self::$request,
+					'response' => $response,
+				)
+			);
+		}
+
+		return $response;
+	}
+}
diff --git a/forms-bridge/addons/slack/hooks.php b/forms-bridge/addons/slack/hooks.php
new file mode 100644
index 00000000..0cc8834f
--- /dev/null
+++ b/forms-bridge/addons/slack/hooks.php
@@ -0,0 +1,148 @@
+<?php
+/**
+ * Slack addon hooks.
+ *
+ * @package formsbridge
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit();
+}
+
+add_filter(
+	'forms_bridge_template_defaults',
+	function ( $defaults, $addon, $schema ) {
+		if ( 'slack' !== $addon ) {
+			return $defaults;
+		}
+
+		return wpct_plugin_merge_object(
+			array(
+				'fields'     => array(
+					array(
+						'ref'      => '#credential',
+						'name'     => 'name',
+						'label'    => __( 'Name', 'forms-bridge' ),
+						'type'     => 'text',
+						'required' => true,
+					),
+					array(
+						'ref'   => '#credential',
+						'name'  => 'schema',
+						'type'  => 'text',
+						'value' => 'Bearer',
+					),
+					array(
+						'ref'   => '#credential',
+						'name'  => 'oauth_url',
+						'label' => __( 'Authorization URL', 'forms-bridge' ),
+						'type'  => 'text',
+						'value' => 'https://slack.com/oauth/v2',
+					),
+					array(
+						'ref'      => '#credential',
+						'name'     => 'client_id',
+						'label'    => __( 'Client ID', 'forms-bridge' ),
+						'type'     => 'text',
+						'required' => true,
+					),
+					array(
+						'ref'      => '#credential',
+						'name'     => 'client_secret',
+						'label'    => __( 'Client secret', 'forms-bridge' ),
+						'type'     => 'text',
+						'required' => true,
+					),
+					array(
+						'ref'      => '#credential',
+						'name'     => 'scope',
+						'label'    => __( 'Scope', 'forms-bridge' ),
+						'type'     => 'text',
+						'value'    => 'chat:write,channels:read,users:read,files:write',
+						'required' => true,
+					),
+					array(
+						'ref'         => '#backend',
+						'name'        => 'name',
+						'description' => __(
+							'Label of the Slack API backend connection',
+							'forms-bridge'
+						),
+						'default'     => 'Slack API',
+					),
+					array(
+						'ref'   => '#backend',
+						'name'  => 'base_url',
+						'type'  => 'url',
+						'value' => 'https://slack.com',
+					),
+					array(
+						'ref'   => '#bridge',
+						'name'  => 'method',
+						'value' => 'POST',
+					),
+				),
+				'credential' => array(
+					'name'          => '',
+					'schema'        => 'Bearer',
+					'oauth_url'     => 'https://slack.com/oauth/v2',
+					'scope'         => 'chat:write,channels:read,users:read',
+					'client_id'     => '',
+					'client_secret' => '',
+					'access_token'  => '',
+					'expires_at'    => 0,
+					'refresh_token' => '',
+				),
+				'backend'    => array(
+					'base_url' => 'https://slack.com',
+					'headers'  => array(
+						array(
+							'name'  => 'Accept',
+							'value' => 'application/json',
+						),
+					),
+				),
+			),
+			$defaults,
+			$schema,
+		);
+	},
+	10,
+	3
+);
+
+add_filter(
+	'http_bridge_oauth_update_tokens',
+	function ( $tokens, $credential ) {
+		if ( false !== strstr( $credential->oauth_url, 'slack.com' ) ) {
+			$tokens['expires_at']               = time() + 60 * 60 * 24 * 365 * 10;
+			$tokens['refresh_token']            = $tokens['access_token'];
+			$tokens['refresh_token_expires_at'] = time() + 60 * 60 * 24 * 365 * 10;
+		}
+
+		return $tokens;
+	},
+	10,
+	2
+);
+
+add_filter(
+	'http_bridge_oauth_url',
+	function ( $url, $verb ) {
+		if ( false === strstr( $url, 'slack.com' ) ) {
+			return $url;
+		}
+
+		if ( 'auth' === $verb ) {
+			return $url .= 'orize';
+		}
+
+		if ( 'token/revoke' === $verb ) {
+			return 'https://slack.com/api/auth.revoke';
+		}
+
+		return 'https://slack.com/api/oauth.v2.access';
+	},
+	10,
+	2
+);
diff --git a/forms-bridge/addons/slack/templates/contact.php b/forms-bridge/addons/slack/templates/contact.php
new file mode 100644
index 00000000..594e18f3
--- /dev/null
+++ b/forms-bridge/addons/slack/templates/contact.php
@@ -0,0 +1,96 @@
+<?php
+/**
+ * Slack addon contact stream bridge template
+ *
+ * @package formsbridge
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit();
+}
+
+return array(
+	'title'       => __( 'Contacts Channel', 'forms-bridge' ),
+	'description' => __(
+		'Contact form template. The resulting bridge will notify form submissions in a Slack channel',
+		'forms-bridge'
+	),
+	'fields'      => array(
+		array(
+			'ref'   => '#bridge',
+			'name'  => 'endpoint',
+			'value' => '/api/chat.postMessage',
+		),
+		array(
+			'ref'         => '#bridge/custom_fields[]',
+			'name'        => 'channel',
+			'label'       => __( 'Channel', 'forms-bridge' ),
+			'description' => __(
+				'Name of the channel where notifications will be sent',
+				'forms-bridge'
+			),
+			'type'        => 'select',
+			'options'     => array(
+				'endpoint' => '/api/conversations.list',
+				'finger'   => array(
+					'value' => 'channels[].id',
+					'label' => 'channels[].name',
+				),
+			),
+		),
+		array(
+			'ref'     => '#form',
+			'name'    => 'title',
+			'default' => __( 'Contacts', 'forms-bridge' ),
+		),
+	),
+	'form'        => array(
+		'title'  => __( 'Contacts', 'forms-bridge' ),
+		'fields' => array(
+			array(
+				'name'     => 'your-name',
+				'label'    => __( 'Your name', 'forms-bridge' ),
+				'type'     => 'text',
+				'required' => true,
+			),
+			array(
+				'name'     => 'your-email',
+				'label'    => __( 'Your email', 'forms-bridge' ),
+				'type'     => 'email',
+				'required' => true,
+			),
+			array(
+				'name'  => 'comments',
+				'label' => __( 'Comments', 'forms-bridge' ),
+				'type'  => 'textarea',
+			),
+		),
+	),
+	'bridge'      => array(
+		'endpoint'  => '/api/chat.postMessage',
+		'mutations' => array(
+			array(
+				array(
+					'from' => 'your-name',
+					'to'   => 'text.name',
+					'cast' => 'string',
+				),
+				array(
+					'from' => 'your-email',
+					'to'   => 'text.email',
+					'cast' => 'string',
+				),
+				array(
+					'from' => '?comments',
+					'to'   => 'text.comments',
+					'cast' => 'string',
+				),
+				array(
+					'from' => 'text',
+					'to'   => 'text',
+					'cast' => 'pretty_json',
+				),
+			),
+		),
+	),
+);
diff --git a/forms-bridge/addons/slack/templates/direct-message.php b/forms-bridge/addons/slack/templates/direct-message.php
new file mode 100644
index 00000000..b3727c07
--- /dev/null
+++ b/forms-bridge/addons/slack/templates/direct-message.php
@@ -0,0 +1,92 @@
+<?php
+/**
+ * Zulip addon direct message bridge template
+ *
+ * @package formsbridge
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit();
+}
+
+return array(
+	'title'       => __( 'Direct Messages', 'forms-bridge' ),
+	'description' => __(
+		'Contact form template. The resulting bridge will send form submissions as direct messages on Slack',
+		'forms-bridge'
+	),
+	'fields'      => array(
+		array(
+			'ref'   => '#bridge',
+			'name'  => 'endpoint',
+			'value' => '/api/chat.postMessage',
+		),
+		array(
+			'ref'     => '#bridge/custom_fields[]',
+			'name'    => 'channel',
+			'label'   => __( 'User', 'forms-bridge' ),
+			'type'    => 'select',
+			'options' => array(
+				'endpoint' => '/api/users.list',
+				'finger'   => array(
+					'value' => 'members[].id',
+					'label' => 'members[].name',
+				),
+			),
+		),
+		array(
+			'ref'     => '#form',
+			'name'    => 'title',
+			'default' => __( 'Direct Messages', 'forms-bridge' ),
+		),
+	),
+	'form'        => array(
+		'title'  => __( 'Direct Messages', 'forms-bridge' ),
+		'fields' => array(
+			array(
+				'name'     => 'your-name',
+				'label'    => __( 'Your name', 'forms-bridge' ),
+				'type'     => 'text',
+				'required' => true,
+			),
+			array(
+				'name'     => 'your-email',
+				'label'    => __( 'Your email', 'forms-bridge' ),
+				'type'     => 'email',
+				'required' => true,
+			),
+			array(
+				'name'  => 'comments',
+				'label' => __( 'Comments', 'forms-bridge' ),
+				'type'  => 'textarea',
+			),
+		),
+	),
+	'bridge'      => array(
+		'endpoint'  => '/api/chat.postMessage',
+		'mutations' => array(
+			array(
+				array(
+					'from' => 'your-name',
+					'to'   => 'text.name',
+					'cast' => 'string',
+				),
+				array(
+					'from' => 'your-email',
+					'to'   => 'text.email',
+					'cast' => 'string',
+				),
+				array(
+					'from' => '?comments',
+					'to'   => 'text.comments',
+					'cast' => 'string',
+				),
+				array(
+					'from' => 'text',
+					'to'   => 'text',
+					'cast' => 'pretty_json',
+				),
+			),
+		),
+	),
+);
diff --git a/forms-bridge/addons/slack/templates/support.php b/forms-bridge/addons/slack/templates/support.php
new file mode 100644
index 00000000..d48d7db6
--- /dev/null
+++ b/forms-bridge/addons/slack/templates/support.php
@@ -0,0 +1,96 @@
+<?php
+/**
+ * Slack addon support channel bridge template
+ *
+ * @package formsbridge
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit();
+}
+
+return array(
+	'title'       => __( 'Support Channel', 'forms-bridge' ),
+	'description' => __(
+		'Support form template. The resulting bridge will notify form submissions in a Slack channel',
+		'forms-bridge'
+	),
+	'fields'      => array(
+		array(
+			'ref'   => '#bridge',
+			'name'  => 'endpoint',
+			'value' => '/api/chat.postMessage',
+		),
+		array(
+			'ref'         => '#bridge/custom_fields[]',
+			'name'        => 'channel',
+			'label'       => __( 'Channel', 'forms-bridge' ),
+			'description' => __(
+				'Name of the channel where notifications will be sent',
+				'forms-bridge'
+			),
+			'type'        => 'select',
+			'options'     => array(
+				'endpoint' => '/api/conversations.list',
+				'finger'   => array(
+					'value' => 'channels[].id',
+					'label' => 'channels[].name',
+				),
+			),
+		),
+		array(
+			'ref'     => '#form',
+			'name'    => 'title',
+			'default' => __( 'Support', 'forms-bridge' ),
+		),
+	),
+	'form'        => array(
+		'title'  => __( 'Support', 'forms-bridge' ),
+		'fields' => array(
+			array(
+				'name'     => 'your-name',
+				'label'    => __( 'Your name', 'forms-bridge' ),
+				'type'     => 'text',
+				'required' => true,
+			),
+			array(
+				'name'     => 'your-email',
+				'label'    => __( 'Your email', 'forms-bridge' ),
+				'type'     => 'email',
+				'required' => true,
+			),
+			array(
+				'name'  => 'comments',
+				'label' => __( 'Comments', 'forms-bridge' ),
+				'type'  => 'textarea',
+			),
+		),
+	),
+	'bridge'      => array(
+		'endpoint'  => '/api/chat.postMessage',
+		'mutations' => array(
+			array(
+				array(
+					'from' => 'your-name',
+					'to'   => 'text.name',
+					'cast' => 'string',
+				),
+				array(
+					'from' => 'your-email',
+					'to'   => 'text.email',
+					'cast' => 'string',
+				),
+				array(
+					'from' => '?comments',
+					'to'   => 'text.comments',
+					'cast' => 'string',
+				),
+				array(
+					'from' => 'text',
+					'to'   => 'text',
+					'cast' => 'pretty_json',
+				),
+			),
+		),
+	),
+);
diff --git a/forms-bridge/addons/zulip/class-zulip-addon.php b/forms-bridge/addons/zulip/class-zulip-addon.php
index b9a3434c..92048ad9 100644
--- a/forms-bridge/addons/zulip/class-zulip-addon.php
+++ b/forms-bridge/addons/zulip/class-zulip-addon.php
@@ -20,7 +20,6 @@
  * Zulip addon class
  */
 class Zulip_Addon extends Addon {
-
 	/**
 	 * Holds the addon's title.
 	 *
diff --git a/forms-bridge/addons/zulip/class-zulip-form-bridge.php b/forms-bridge/addons/zulip/class-zulip-form-bridge.php
index 0e0a66b9..c437ec51 100644
--- a/forms-bridge/addons/zulip/class-zulip-form-bridge.php
+++ b/forms-bridge/addons/zulip/class-zulip-form-bridge.php
@@ -18,7 +18,6 @@
  * Form bridge implamentation for the Zulip API.
  */
 class Zulip_Form_Bridge extends Form_Bridge {
-
 	/**
 	 * Submits payload and attachments to the bridge's backend.
 	 *
diff --git a/forms-bridge/deps/http b/forms-bridge/deps/http
index 418b5932..803b7a4d 160000
--- a/forms-bridge/deps/http
+++ b/forms-bridge/deps/http
@@ -1 +1 @@
-Subproject commit 418b593220c9babdeeed18c7f78a57d9fadd3bfd
+Subproject commit 803b7a4de09d1a382792a5c1b857a4a3974186bb
diff --git a/src/components/Credential/AuthorizeButton.jsx b/src/components/Credential/AuthorizeButton.jsx
index d949cb2c..554dcddf 100644
--- a/src/components/Credential/AuthorizeButton.jsx
+++ b/src/components/Credential/AuthorizeButton.jsx
@@ -47,11 +47,11 @@ export default function AuthorizeButton({ addon, data }) {
       method: "POST",
       data: { credential: data },
     })
-      .then(({ success }) => {
+      .then(({ success, redirect_url }) => {
         if (!success) throw "error";
 
         const form = document.createElement("form");
-        form.action = data.oauth_url + "/auth";
+        form.action = redirect_url;
         form.method = "GET";
         form.target = "_blank";
 
diff --git a/src/components/Templates/Wizard/useAuthorizedCredential.js b/src/components/Templates/Wizard/useAuthorizedCredential.js
index d288b043..541690cc 100644
--- a/src/components/Templates/Wizard/useAuthorizedCredential.js
+++ b/src/components/Templates/Wizard/useAuthorizedCredential.js
@@ -107,12 +107,12 @@ export default function useAuthorizedCredential({ data = {}, fields = [] }) {
       method: "POST",
       data: { credential },
     })
-      .then(({ success }) => {
+      .then(({ success, redirect_url }) => {
         if (!success) throw "error";
 
         const form = document.createElement("form");
         form.method = "GET";
-        form.action = credential.oauth_url + "/auth";
+        form.action = redirect_url;
         form.target = "_blank";
 
         let innerHTML = `