Additional WooCommerce Settings Page for a Payment Gateway | https://www.ibenic.com/additional-woocommerce-settings-page-for-a-payment-gateway

button.php

<?php
class WC_Custom_PayPal extends WC_Gateway_Paypal {
  
  /**
  * Screen button Field
  */
  public function generate_screen_button_html( $key, $value ) { 
  ?>
    <tr valign="top">
        <td colspan="2" class="forminp forminp-<?php echo sanitize_title( $value['type'] ) ?>">
             <a href="<?php echo admin_url( 'admin.php?page=wc-settings&tab=checkout&section=paypal&screen=other' ); ?>" class="button"><?php _e( 'Go to Other Settings', 'custom_paypal' ); ?></a>
        </td>
    </tr>
    <tr valign="top">
        <td colspan="2" class="forminp forminp-<?php echo sanitize_title( $value['type'] ) ?>">
             <a href="<?php echo admin_url( 'admin.php?page=wc-settings&tab=checkout&section=paypal&screen=orders' ); ?>" class="button"><?php _e( 'Orders Paid with This', 'custom_paypal' ); ?></a>
        </td>
    </tr>
   <?php
  }
}

fields.php

<?php
class WC_Custom_PayPal extends WC_Gateway_Paypal {

  /**
   * Setting a screen button in fields
   * @return void 
   */
  public function init_form_fields() {
      parent::init_form_fields();
      $this->form_fields = array_merge( $this->form_fields, array(
          'screen_button' => array(
              'id'    => 'screen_button',
              'type'  => 'screen_button',
              'title' => __( 'Other Settings', 'custom_paypal' ),
          )
      )); 
  }
}

load.php

<?php

add_action( 'plugins_loaded', function(){
if( class_exists( 'WC_Gateway_Paypal' ) ) {
  
  class WC_Custom_PayPal extends WC_Gateway_Paypal {
    // Other Code will go here.
  }

  add_action( 'woocommerce_payment_gateways', 'wc_change_paypal' );
  
  /**
  * Removing the existing PayPal Gateway and adding our own.
  *
  * @param  array $gateways All Registered Gateways
  * @return array 
  */
  function wc_change_paypal( $gateways ) {
        for( $i = 0; $i < count( $gateways ); $i++ ) {
            if( 'WC_Gateway_Paypal' === $gateways[ $i ] ) {
                unset( $gateways[ $i ] );
            }
        }

        $gateways[] = 'WC_Custom_PayPal';
        return $gateways;
    }
}

orders.php

<?php
//... Goes in public function admin_options() {
if( $orders ) {
?>

<table class="form-table">
    <thead>
        <tr>
            <?php foreach ( wc_get_account_orders_columns() as $column_id => $column_name ) : 
                if( 'order-actions' === $column_id ) { 
                    continue;
                }
            ?>
                <td><strong><?php echo esc_html( $column_name ); ?></strong></td>
            <?php endforeach; ?>
        </tr>
    </thead>

    <tbody>
        <?php foreach ( $orders as $customer_order ) :
            $order      = wc_get_order( $customer_order );
            $item_count = $order->get_item_count();
            ?>
            <tr class="woocommerce-orders-table__row woocommerce-orders-table__row--status-<?php echo esc_attr( $order->get_status() ); ?> order">
                <?php foreach ( wc_get_account_orders_columns() as $column_id => $column_name ) : ?>
                    <td class="woocommerce-orders-table__cell woocommerce-orders-table__cell-<?php echo esc_attr( $column_id ); ?>" data-title="<?php echo esc_attr( $column_name ); ?>">


                        <?php if ( 'order-number' === $column_id ) : ?>
                            <a href="<?php echo esc_url( $order->get_view_order_url() ); ?>">
                                <?php echo _x( '#', 'hash before order number', 'woocommerce' ) . $order->get_order_number(); ?>
                            </a>

                        <?php elseif ( 'order-date' === $column_id ) : ?>
                            <time datetime="<?php echo esc_attr( $order->get_date_created()->date( 'c' ) ); ?>"><?php echo esc_html( wc_format_datetime( $order->get_date_created() ) ); ?></time>

                        <?php elseif ( 'order-status' === $column_id ) : ?>
                            <?php echo esc_html( wc_get_order_status_name( $order->get_status() ) ); ?>

                        <?php elseif ( 'order-total' === $column_id ) : ?>
                            <?php
                            /* translators: 1: formatted order total 2: total order items */
                            printf( _n( '%1$s for %2$s item', '%1$s for %2$s items', $item_count, 'woocommerce' ), $order->get_formatted_order_total(), $item_count );
                            ?>

                        <?php endif; ?>
                    </td>
                <?php endforeach; ?>
            </tr>
        <?php endforeach; ?>
    </tbody>
</table>

<?php } else {
    echo '<p>' . __( 'No orders done yet with this gateway', 'custom_paypal' ) . '</p>';
} 

other_fields.php

<?php
class WC_Custom_PayPal extends WC_Gateway_Paypal {
  
  /**
  * Form Fields for Other Screen
  */
  public function other_form_fields() {
    return array(
        'convert' => array(
            'type' => 'checkbox',
            'id' => 'convert',
            'title' => __( 'Convert?', 'custom_paypal' ),
            'description' => __( 'Convert other currencies?', 'custom_paypal' ),
        ),
    );
  }
}

process.php

<?php
class WC_Custom_PayPal extends WC_Gateway_Paypal {
  
  /**
  * Redefining how options are saved for this gateway.
  * If we are on a second screen, we will save the other fields.
  * If we are not on the second screen, save the original fields.
  */
  public function process_admin_options() {
    if( isset( $_GET['screen'] ) && '' !== $_GET['screen'] ) {
        WC_Admin_Settings::save_fields( $this->other_form_fields() );
    } else {
        parent::process_admin_options();
    }
  }
}

screens.php

<?php
class WC_Custom_PayPal extends WC_Gateway_Paypal {
  
  /**
  * Redefining the display of options.
  * If we are on a second screen, we will show the other fields.
  * If we are not on the second screen, show the original fields.
  */
  public function admin_options() {
    if( ! isset( $_GET['screen'] ) || '' === $_GET['screen'] ) {
        parent::admin_options();
    } else { 
      if( 'orders' === $_GET['screen'] ) {  
        echo '<h2><a href="' . admin_url( 'admin.php?page=wc-settings&tab=checkout&section=paypal' ) . '">' . $this->method_title . '</a> > ' . __( 'Orders done with PayPal', 'custom_paypal' ) . '</h2>';
        $hide_save_button = true; // Remove the submit button.
        $orders = wc_get_orders(array(
            'limit' => '-1',
            'payment_method' => $this->id,
        )); 
        if( $orders ) { 
          // Code for Orders will go here
        }
       } else {
        echo '<h2><a href="' . admin_url( 'admin.php?page=wc-settings&tab=checkout&section=paypal' ) . '">' . $this->method_title . '</a> > ' . __( 'Other Settings', 'custom_paypal' ) . '</h2>';
        echo '<table class="form-table">';
            WC_Admin_Settings::output_fields( $this->other_form_fields() );
        echo '</table>';
      }
    }
  }
}