Adding things only on checkout

add_action('woocommerce_before_checkout_form_cart_notices', 'add_custom_coupon_message');

function add_custom_coupon_message( ){ ?>
 <div class="class-disclaimer">
      <div class="dicon">
        <img src="https://online.crushfitnessindia.com/wp-content/uploads/2020/04/Group-1398.svg">     
      </div>
      <div class="text">
        <h3>Pay as much as you want- Only for Group Fitness Classes</h3>
        <p>Just enter the amount you want to pay in multiples of <span style="font-weight: bold">10</span> in the <span style="font-weight: bold">'Coupon Code field'</span> at checkout. </p>
        <p>For example, if you want to pay INR 40 for a class, enter <span style="font-weight: bold">40</span> in <span style="font-weight: bold">'Coupon Code field'</span> and the price for the class will change to INR 40 plus GST</p>
         <p>For 100% discount use coupon code- 'FREE', we hope you would support us in these COVID-19 times and use this code only if absolute neccessary.</p>
      </div>
    </div>
 <?php
}