public function bind_implementations() {
		// some classes will require an instance of this class as a dependency so we alias it here
		tribe_singleton( 'Tribe__Tickets__Commerce__PayPal__Main', $this );

		tribe_singleton( 'tickets.commerce.paypal.view', 'Tribe__Tickets__Commerce__PayPal__Tickets_View' );
		tribe_singleton( 'tickets.commerce.paypal.handler.ipn', 'Tribe__Tickets__Commerce__PayPal__Handler__IPN', array( 'hook' ) );
		tribe_singleton( 'tickets.commerce.paypal.handler.pdt', 'Tribe__Tickets__Commerce__PayPal__Handler__PDT', array( 'hook' ) );
		tribe_singleton( 'tickets.commerce.paypal.gateway', 'Tribe__Tickets__Commerce__PayPal__Gateway', array( 'hook', 'build_handler' ) );
		tribe_singleton( 'tickets.commerce.paypal.notices', 'Tribe__Tickets__Commerce__PayPal__Notices' );
		tribe_singleton( 'tickets.commerce.paypal.endpoints', 'Tribe__Tickets__Commerce__PayPal__Endpoints', array( 'hook' ) );
		tribe_singleton( 'tickets.commerce.paypal.endpoints.templates.success', 'Tribe__Tickets__Commerce__PayPal__Endpoints__Success_Template' );
		tribe_singleton( 'tickets.commerce.paypal.orders.tabbed-view', 'Tribe__Tickets__Commerce__Orders_Tabbed_View' );
		tribe_singleton( 'tickets.commerce.paypal.orders.report', 'Tribe__Tickets__Commerce__PayPal__Orders__Report' );
		tribe_singleton( 'tickets.commerce.paypal.orders.sales', 'Tribe__Tickets__Commerce__PayPal__Orders__Sales' );
		tribe_singleton( 'tickets.commerce.paypal.screen-options', 'Tribe__Tickets__Commerce__PayPal__Screen_Options', array( 'hook' ) );
		tribe_singleton( 'tickets.commerce.paypal.stati', 'Tribe__Tickets__Commerce__PayPal__Stati' );
		tribe_singleton( 'tickets.commerce.paypal.currency', 'Tribe__Tickets__Commerce__Currency', array( 'hook' ) );
		tribe_singleton( 'tickets.commerce.paypal.links', 'Tribe__Tickets__Commerce__PayPal__Links' );
		tribe_singleton( 'tickets.commerce.paypal.oversell.policies', 'Tribe__Tickets__Commerce__PayPal__Oversell__Policies' );
		tribe_singleton( 'tickets.commerce.paypal.oversell.request', 'Tribe__Tickets__Commerce__PayPal__Oversell__Request' );
		tribe_singleton( 'tickets.commerce.paypal.frontend.tickets-form', 'Tribe__Tickets__Commerce__PayPal__Frontend__Tickets_Form' );
		tribe_register( 'tickets.commerce.paypal.cart', 'Tribe__Tickets__Commerce__PayPal__Cart__Unmanaged' );

		tribe()->tag( array(
			'tickets.commerce.paypal.shortcodes.tpp-success' => 'Tribe__Tickets__Commerce__PayPal__Shortcodes__Success',
		), 'tpp-shortcodes' );

		/** @var Tribe__Tickets__Commerce__PayPal__Shortcodes__Interface $shortcode */
		foreach ( tribe()->tagged( 'tpp-shortcodes' ) as $shortcode ) {
			add_shortcode( $shortcode->tag(), array( $shortcode, 'render' ) );
		}

		tribe( 'tickets.commerce.paypal.gateway' );
		tribe( 'tickets.commerce.paypal.orders.report' );
		tribe( 'tickets.commerce.paypal.screen-options' );
		tribe( 'tickets.commerce.paypal.endpoints' );
		tribe( 'tickets.commerce.paypal.currency' );
	}