API reference

Public identifiers

Lex\\Notifications\\Slack\\Channel\\SlackChannel: Implements the core ChannelInterface. The channel name returned by getName() is slack. send(object, Notification): void resolves the route, calls toSlack() and hands the message to the transport. It does not return a Slack message timestamp.
Lex\\Notifications\\Slack\\Configuration\\SlackRoute: Immutable destination value object with public readonly transport and destination properties.
Lex\\Notifications\\Slack\\Message\\SlackMessage: Immutable message payload with JsonSerializable support.
Lex\\Notifications\\Slack\\Transport\\SlackTransport: Sends an HTTPS request. send(SlackMessage, SlackRoute): array returns the Slack acknowledgement; when using the API this may contain Slack's ts and channel fields.
Lex\\Notifications\\Slack\\Configuration\\SlackConfiguration: Reads configuration through TYPO3's extension configuration service. Provides botToken(), namedWebhook(), apiEndpoint(), timeout(), and connectTimeout().
Lex\\Notifications\\Slack\\Exception\\SlackTransportException: Exception carrying HTTP status, retry delay and retryability.
Lex\\Notifications\\Slack\\Domain\\Model\\Ability\\CanSendToSlack: Trait declaring toSlack(object $notifiable): SlackMessage.
Lex\\Notifications\\Slack\\Domain\\Model\\Ability\\HasRouteNotificationForSlack: Trait declaring routeNotificationForSlack(?Notification $notification = null).

SlackRoute factory methods

Method	Result
`webhook(string $url)`	Validate and store a direct webhook URL.
`webhookNamed(string $name)`	Store a configuration alias.
`api(string $channel, ?string $token = null)`	Validate and store a Slack ID.
`fromString(string $value)`	Interpret a direct HTTPS URL, `webhook:name` or API ID.
`assertWebhookUrl(string $url)`	Validate the Slack/GovSlack HTTPS URL; throws on failure.

SlackMessage factory and modifier methods

Method	Purpose
`text(string $text)`	Create a plain-text message.
`fromArray(array $payload)`	Create from a permitted Slack payload array.
`fromJson(string $json)`	Create from Block Kit Builder JSON or a block list.
`fromBlockKit(BlockKitMessage $message)`	Validate and serialize a Block Kit PHP surface.
`withText(string $text)`	Return a copy with fallback text.
`withBlocks(array $blocks)`	Return a copy with blocks.
`withAttachments(array $attachments)`	Return a copy with legacy attachments.
`inThread(string $timestamp, bool $broadcast = false)`	Return a threaded message.
`withoutUnfurling()`	Disable link/media previews.
`toArray()`	Get payload array.
`toJson()`	Serialize message as JSON.

Messages may not set channel or token; these are managed by the route and transport. Unsupported message keys and structurally invalid payloads raise InvalidArgumentException.

Service registration

SlackChannel is automatically registered by its #[AutoconfigureTag('notifications.channel')] attribute. TYPO3's Configuration/Services.yaml enables autowiring/autoconfiguration. No additional manual service tagging is needed.

See Error handling for exception details.