aims.js

$(document).ready(function() {
   $('.js-aims').each(function () {
     var $this = $(this);
     
     $this.on($this.data('aimEvent') || 'click', function () {
       setAim($this.data('aim'));
     });
   });
});

checkout.html

<form id="checkout_form" class="js-aims" data-aim="SOME_SUBMIT_AIM" data-aim-event="submit">
  <!-- ...-->
</form>

<button class="js-aims" data-aim="NORMAL_CLICK_AIM"></button>