gistfile1.php

// <?php the_field('partner_id', 'options'); ?> simply returns 100 which is set in a field in the back end. 

<form class="ibanking-form" name="OAC" action="<?php echo get_field('ibanking_url', 'option'); ?>" method="post" enctype="application/x-www-form-urlencoded">
  <input type="hidden" name="id" value="<?php the_field('vendor_id', 'options'); ?>">
  <input type="hidden" name="ResetDGM" value="true">
  <input type="hidden" name="prodid" value="<?php the_sub_field('apply_product_id'); ?>">
  <?php if( get_field('partner_id', 'options') ) : ?>
    <input type="hidden" name="partid" value="<?php the_field('partner_id', 'options'); ?>">
  <?php endif; ?>
  <a onclick="get_form(this).submit(); return false" class="btn btn--home-apply <?php if(get_sub_field('btn_xlarge')) echo " btn--xlarge "; ?> <?php if(get_sub_field('button_style')) the_sub_field('button_style'); ?> btn--submit <?php if(get_sub_field('no_padding')) echo " btn--submit--no-padding "; ?> ">Apply Now</a>
</form>