functions.php

<?php

function add_parent_styles() {
	wp_enqueue_style('style', get_template_directory_uri() . '/style.css');
}

add_action('wp_enqueue_scripts','add_parent_styles');

// redirect to checkout after added to cart
add_filter( 'add_to_cart_redirect', 'woo_redirect_to_checkout' );

function woo_redirect_to_checkout() {
 	global $woocommerce;
 	$checkout_url = $woocommerce->cart->get_checkout_url();
 	return $checkout_url;
}

// custom message on checkout page
add_filter( 'wc_add_to_cart_message', 'woo_add_to_cart_message' );

function woo_add_to_cart_message() {
	global $woocommerce;
	$message    = __('Membership Selected for Purchase, fill out the form below and pay to gain access.', 'woocommerce' );
	return $message;
}

// change add to cart on shop page
add_filter( 'woocommerce_product_add_to_cart_text' , 'woo_product_add_to_cart_text' );

function woo_product_add_to_cart_text() {
 	return __( 'Purchase Membership!', 'woocommerce' );
}

// change add to cart message on product page
add_filter( 'woocommerce_product_single_add_to_cart_text', 'woo_custom_cart_button_text' );    // 2.1 +

function woo_custom_cart_button_text() {
        return __( 'Purchase Membership', 'woocommerce' );
}

// remove not needed checkout fields
add_filter( 'woocommerce_checkout_fields' , 'woo_checkout_fields' );

function woo_checkout_fields( $fields ) {
     unset($fields['billing']['billing_last_name']);
     unset($fields['billing']['billing_company']);
     unset($fields['billing']['billing_address_1']);
     unset($fields['billing']['billing_address_2']);
     unset($fields['billing']['billing_city']);
     unset($fields['billing']['billing_postcode']);
     unset($fields['billing']['billing_country']);
     unset($fields['billing']['billing_state']);
     unset($fields['billing']['billing_phone']);
     unset($fields['shipping']['shipping_first_name']);
     unset($fields['shipping']['shipping_last_name']);
     unset($fields['shipping']['shipping_company']);
     unset($fields['shipping']['shipping_address_1']);
     unset($fields['shipping']['shipping_address_2']);
     unset($fields['shipping']['shipping_city']);
     unset($fields['shipping']['shipping_postcode']);
     unset($fields['shipping']['shipping_country']);
     unset($fields['shipping']['shipping_state']);
     unset($fields['order']['order_comments']); 
     return $fields;
}

// make it so only 1 item can be bought
add_filter( 'woocommerce_is_sold_individually', '__return_true');

// disable additional information title
add_filter('woocommerce_enable_order_notes_field', '__return_false');

remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_title', 5 );

// remove login option on checkout
remove_action( 'woocommerce_before_checkout_form', 'woocommerce_checkout_login_form', 10 );

// remove tags and categories
remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_meta', 40 );

// remove breadcrumbs
remove_action('woocommerce_before_main_content', 'woocommerce_breadcrumb', 20, 0);

// remove tabs
remove_action('woocommerce_after_single_product_summary', 'woocommerce_output_product_data_tabs', 10);

// remove sidebar
remove_action('woocommerce_sidebar', 'woocommerce_get_sidebar', 10);

function woo_custom_detail_label( $translated_text, $text, $domain ) {
    switch ( $translated_text ) {
        case 'Billing Details' : 
            $translated_text = __( 'Fill out the Fields and Pay to Get Access to Our Content', 'woocommerce' );
            break;

        case 'Your order' : 
            $translated_text = __( 'Here is a summary of your Members Access Purchase', 'woocommerce' );
            break;
    }

    return $translated_text;
}

add_filter( 'gettext', 'woo_custom_detail_label', 20, 3 );

// hide quantity from checkout
add_filter('woocommerce_checkout_cart_item_quantity', '__return_false');

// show message with checkout link if membership added twice
add_filter( 'woocommerce_add_to_cart_validation', 'woo_cart_items_custom_message' , 99, 3);

function woo_cart_items_custom_message( $valid, $product_id, $quantity ) {

    global $woocommerce;

    if($woocommerce->cart->cart_contents_count > 0){
    	wc_add_notice( sprintf('<a href="%s" class="button wc-forward">%s</a> %s', $woocommerce->cart->get_checkout_url(), __( 'Checkout.', 'woocommerce' ), sprintf( __( 'You have already selected a Unlimited Access %s to purchase.', 'woocommerce' ), 'Membership') ), 'error' );
	$valid = false;
    }

   return $valid;
}