WooCommerce

// =========================================================================
// DISABLE COD PAYMENT METHOD FOR SPECIFIC COUNTRY - DE
// =========================================================================
add_filter( 'woocommerce_available_payment_gateways', 'payment_gateway_disable_country_de' );
  
function payment_gateway_disable_country_de( $available_gateways ) {
    if ( is_admin() ) return;
    if ( isset( $available_gateways['authorize'] ) && WC()->customer->get_billing_country() <> 'DE' ) {
        unset( $available_gateways['authorize'] );
    } else {
        if ( isset( $available_gateways['cod'] ) && WC()->customer->get_billing_country() == 'DE' ) {
            unset( $available_gateways['cod'] );
        }
    }
    return $available_gateways;
}

// =========================================================================
// ADD FEE TO SPECIFIC PAYMENT GATEWAY => COD - ONLY FOR PHYSICAL PRODUCT
// =========================================================================
// Part 1: assign fee
 
add_action( 'woocommerce_cart_calculate_fees', 'add_checkout_fee_for_gateway' );
 
function add_checkout_fee_for_gateway() {
    
     
    foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
        // Check if there are non-virtual products
        if ( ! $cart_item['data']->is_virtual() ) {
            $chosen_gateway = WC()->session->chosen_payment_method;
  
              if ( $chosen_gateway == 'cod' ) {

              // Note: edit "Fee" and "5" below to control Label and Fee Amount
              WC()->cart->add_fee( __('Utánvét díja', 'woocommerce'), 510 );

              }
        }
    }
 
}
 
// Part 2: reload checkout on payment gateway change
 
add_action( 'woocommerce_review_order_before_payment', 'refresh_checkout_on_payment_methods_change' );
 
function refresh_checkout_on_payment_methods_change(){
    ?>
    <script type="text/javascript">
        (function($){
            $( 'form.checkout' ).on( 'change', 'input[name^="payment_method"]', function() {
                $('body').trigger('update_checkout');
            });
        })(jQuery);
    </script>
    <?php
}

// =========================================================================
// ADD CUSTOM MESSAGE IF SPECIFIC PRODUCT CATEGORY OUT OF STOCK
// =========================================================================
add_filter( 'woocommerce_get_availability', 'woo_custom_get_availability', 1, 2);
function woo_custom_get_availability( $availability, $_product ) {
    
    global $product;
    //CATEGORY 1
    if ( has_term( 'CATEGORY_NAME_1', 'product_cat', $product->get_id() ) ) {
        // Change In Stock Text
        if ( $_product->is_in_stock() ) {
            $availability['availability'] = __('Available!', 'woocommerce');
        }
        // Change Out of Stock Text
        if ( ! $_product->is_in_stock() ) {
            $availability['availability'] = __('Jelenleg nincs kitűzve tréning időpont', 'woocommerce');
        }
        return $availability;
    }
    //CATEGORY 2
    else if ( has_term( 'CATEGORY_NAME_2', 'product_cat', $product->get_id() ) ) {
        // Change In Stock Text
        if ( $_product->is_in_stock() ) {
            $availability['availability'] = __('Available!', 'woocommerce');
        }
        // Change Out of Stock Text
        if ( ! $_product->is_in_stock() ) {
            $availability['availability'] = __('Jelenleg nincs kitűzve tréning időpont', 'woocommerce');
        }
        return $availability;
    }
    else{
        // Change In Stock Text
        if ( $_product->is_in_stock() ) {
            $availability['availability'] = __('Készleten', 'woocommerce');
        }
        // Change Out of Stock Text
        if ( ! $_product->is_in_stock() ) {
            $availability['availability'] = __('Elfogyott', 'woocommerce');
        }
        return $availability;
    }
}

https://flexibleshipping.com/woocommerce-free-shipping-over-amount/

//DISABLE COD PAYMENT FOR SPECIFIC PRODUCT CATEGORY
function unset_payment_cod_for_online_trening( $available_gateways ) {
    global $woocommerce;
    $unset = false;
    $category_ids = array( 109 );
    foreach ( $woocommerce->cart->cart_contents as $key => $values ) {
        $terms = get_the_terms( $values['product_id'], 'product_cat' );    
        foreach ( $terms as $term ) {        
            if ( in_array( $term->term_id, $category_ids ) ) {
                $unset = true;
                break;
            }
        }
    }
        if ( $unset == true ) unset( $available_gateways['cod'] );
        return $available_gateways;
}
add_action( 'woocommerce_available_payment_gateways', 'unset_payment_cod_for_online_trening', 5 );

<?php
//Disable Payment Gateway For Specific Shipping Method

add_filter( 'woocommerce_available_payment_gateways', 'wpflames_gateway_disable_shipping_368' );

function wpflames_gateway_disable_shipping_368( $available_gateways ) {

    global $woocommerce;

    if ( !is_admin() ) {

        $chosen_methods = WC()-&amp;gt;session-&amp;gt;get( 'chosen_shipping_methods' );

        $chosen_shipping = $chosen_methods[0];

        //Free shipping
        if ( isset( $available_gateways['cod'] ) && 0 === strpos( $chosen_shipping, 'free_shipping' ) ) {
            unset( $available_gateways['cod'] );
        }

        //Flat rate
        if ( isset( $available_gateways['cod'] ) && 0 === strpos( $chosen_shipping, 'flat_rate' ) ) {
            unset( $available_gateways['cheque'] );
        }
        //Local pickup
        if ( isset( $available_gateways['cod'] ) && 0 === strpos( $chosen_shipping, 'local_pickup' ) ) {
            unset( $available_gateways['cod'] );
        }
        
        //Cheque
        if ( isset( $available_gateways['cod'] ) && 0 === strpos( $chosen_shipping, 'flat_rate:2' ) ) {
            unset( $available_gateways['cheque'] );
        }

    }

return $available_gateways;

}

add_action( 'woocommerce_email_before_order_table', 'add_online_trening_welcome_email_text', 10, 2 );

function add_online_trening_welcome_email_text( $order, $sent_to_admin ) {

    if ( ! $sent_to_admin ) {

        foreach( $order->get_items() as $item ) {
            $product = wc_get_product( $item['product_id'] );

            // Use the name or product ID here
            if( $product->get_id() == 2767  ) {
                echo '<p style="text-align: center">A befizetést követően 1 munkanapon belül e-mailben megkapod a leírást, hogyan tudod elérni az online videókat. A számlád postán érkezik. Köszönöm, hogy a módszeremet választottad. Köszönöm, hogy tenni akarsz magadért.</p>';
            }
        }
    }
}

//APPLY COUPON AUTOMATICALLY IF PRODUCT ID IS IN THE CART
add_action( 'woocommerce_before_cart', 'wpninja_apply_matched_coupons' );
 
function wpninja_apply_matched_coupons() {
 
    $coupon_code = 'sapikupon'; 
 
    if ( WC()->cart->has_discount( $coupon_code ) ) return;
 
    foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
 
        // this is your product ID
        $autocoupon = array( 1035 );

        if( in_array( $cart_item['product_id'], $autocoupon ) ) {   
            WC()->cart->add_discount( $coupon_code );
            wc_print_notices();
        }
    
    }
 
}

add_filter( 'woocommerce_product_filters', 'wpninja_filter_by_custom_taxonomy_dashboard_products' );
 
function wpninja_filter_by_custom_taxonomy_dashboard_products( $output ) {
   
  global $wp_query;
 
  $output .= wc_product_dropdown_categories( array(
    'show_option_none' => 'Filter by product tag',
    'taxonomy' => 'product_tag',
    'name' => 'product_tag',
    'selected' => isset( $wp_query->query_vars['product_tag'] ) ? $wp_query->query_vars['product_tag'] : '',
  ) );
   
  return $output;
}