add_filter('woocommerce_product_single_add_to_cart_text', 'woo_custom_cart_button_text');
 
function woo_custom_cart_button_text() {
return __('Book Now', 'woocommerce');
}

Divi BodyCommerce is a third-party plugin for Divi that gives you control over your store’s design from the product page to the checkout page and everything between. It’s designed with conversions in mind and gives you full control over your store’s design using the Divi Builder.
When a plugin offers...

Amazon Payments Setup for WooCommerce. out of date but provides some clues.

function CM_woocommerce_account_menu_items_callback($items) {
unset( $items['downloads'] );
return $items;
}
add_filter('woocommerce_account_menu_items', 'CM_woocommerce_account_menu_items_callback', 10, 1);

Excellent tutorial on WooCommerce. Also features FlatSome theme.