Calendly bookings logic on order completed

// Postpone Order Completed Email Hook
add_action( 'woocommerce_init', function() {

	$email_class = WC()->mailer();
	$removed = remove_action( 'woocommerce_order_status_completed_notification',
		array( $email_class->emails['WC_Email_Customer_Completed_Order'], 'trigger' ) );
	if( $removed ) {
		add_action( 'woocommerce_order_status_completed_notification',
			array( $email_class->emails['WC_Email_Customer_Completed_Order'], 'trigger' ), 20 );
	}

} );

// Order Completed Hook
add_action( 'woocommerce_order_status_completed', function( $order_id ) {

	// Get Order Data
	global $wpdb;
	$order = wc_get_order( $order_id );

	// Loop Order Items
	foreach( $order->get_items() as $order_item ) {

		// Get Line Item Data
		$order_item_data = $order_item->get_data();

		// Skip Line Items Missing Product, Variation
		if(
			empty( $order_item_data['product_id'] )
			|| empty( $order_item_data['variation_id'] )
		) {
			continue;
		}

		// Skip Line Items Missing Downloadable Product Variation
		$product_variation = wc_get_product(
			$order_item_data['variation_id']
		);
		if( ! $product_variation->is_downloadable() ) {
			continue;
		}

		// Skip Line Items Missing Consultation Package Attribute
		$product_attributes = $product_variation->get_attributes();
		if( empty( $product_attributes['consultation-package'] ) ) {
			continue;
		}

		// Get Calendly User ID
		$product = wc_get_product( $order_item_data['product_id'] );
		$user_id = $product->get_meta( 'user_id' );
		if( ! $user_id ) {
			$message = 'Error: Unable to find Consultant User ID.';
			$order->add_order_note( $message );
			return;
		}

		// Get Calendly Token
		$calendly_url = 'https://api.calendly.com';
		$calendly_token = get_user_meta( $user_id, 'calendly_token', true );
		if( ! $calendly_token ) {
			$message = 'Error: Unable to find Consultant Calendly Token.';
			$order->add_order_note( $message );
			return;
		}

		// Get User's URI
		$args = [
			'headers' => [
				'Authorization' => 'Bearer ' . $calendly_token,
				'Content-Type' => 'application/json',
			],
		];
		$response = wp_remote_get( $calendly_url . '/users/me', $args );
		$response_body = wp_remote_retrieve_body( $response );
		$response_body = json_decode( $response_body );
		$user_uri = isset( $response_body->resource->uri )
			? $response_body->resource->uri : '';
		if( ! $user_uri ) {
			wc_get_logger()->debug( wc_print_r( [ $args, $response_body ], true ) );
			$message = 'Calendly error: Unable to find user - see debug log.';
			$order->add_order_note( $message );
			return;
		}

		// Get User's Event Types
		$args = [
			'body' => [ 'user' => $user_uri ],
			'headers' => [
				'Authorization' => 'Bearer ' . $calendly_token,
				'Content-Type' => 'application/json',
			],
		];
		$response = wp_remote_get( $calendly_url . '/event_types', $args );
		$response_body = wp_remote_retrieve_body( $response );
		$response_body = json_decode( $response_body );
		$event_type_uri = '';
		foreach( (array) $response_body->collection as $event_type ) {
			if( $event_type->name === $product_attributes['consultation-package'] ) {
				$event_type_uri = isset( $event_type->uri )
					? $event_type->uri : '';
			}
		}
		if( ! $event_type_uri ) {
			wc_get_logger()->debug( wc_print_r( [ $args, $response_body ], true ) );
			$message = 'Calendly error: Unable to match Event Type - see debug log.';
			$order->add_order_note( $message );
			return;
		}


		// Get One Time Link
		$args = [
			'body' => [
				'max_event_count' => 1,
				'owner' => $event_type_uri,
				'owner_type' => 'EventType',
			],
			'headers' => [
				'Authorization' => 'Bearer ' . $calendly_token,
				'Content-Type' => 'application/x-www-form-urlencoded',
			],
		];
		$response = wp_remote_post( $calendly_url . '/scheduling_links', $args );
		$response_body = wp_remote_retrieve_body( $response );
		$response_body = json_decode( $response_body );
		$booking_url = isset( $response_body->resource->booking_url )
			? $response_body->resource->booking_url : '';
		if( ! $booking_url ) {
			wc_get_logger()->debug( wc_print_r( [ $args, $response_body ], true ) );
			$message = 'Calendly error: Unable to retrieve Booking URL.';
			$order->add_order_note( $message );
			return;
		}

		// Add Order Note
		$message = sprintf(
			'Assigned consultation package Booking URL %s',
			$booking_url,
		);
		$order->add_order_note( $message );

		// Add Line Item Meta
		wc_update_order_item_meta(
			$order_item->get_id(),
			'Booking URL',
			$booking_url
		);

	} // End Order Items Loop

} );