function bbp_post_request() {

	// Bail if not a POST action
	if ( ! bbp_is_post_request() ) {
		return;
	}

	// Bail if no action
	if ( empty( $_POST['action'] ) ) {
		return;
	}

	// Sanitize the POST action
	$action = sanitize_key( $_POST['action'] );

	// Bail if action was totally invalid
	if ( empty( $action ) ) {
		return;
	}

	// This dynamic action is probably the one you want to use. It narrows down
	// the scope of the 'action' without needing to check it in your function.
	do_action( 'bbp_post_request_' . $action );

	// Use this static action if you don't mind checking the 'action' yourself.
	do_action( 'bbp_post_request',   $action );
}