How to include a page template and template part into my plugin

I am creating my first plugin with a template for the frontend.

My current structure is:

/my_plugin/views/page_templates

I have 2 main issues I am trying to resolve

1. Is this the best way to include a template
2. How to include external files into template using get_template_part()

The template code:

function mbbp_frontend_page_layout($page_template) {
    global $post;
    
    if ( is_page(bookings) ) {
        
        $page_template = MBBP_BOOKING_PLUGIN_DIR_PATH . '/views/page-bookings.php';
        
    }
    return $page_template;
}
add_filter(page_template, mbbp_frontend_page_layout);

And then, within page-bookings.php I have included:

?php get_template_part( 'page-templates', 'payment-form' ); ?

The get_template_part() code is not including anything so I am assuming it is because of the way my template is included in the plugin but as this my first plugin, I do not know how to better handle this.