Each form (so each brand website) has its own integration urls to allow different configurations. But the embedding itself is the same for all. All that has to be done is to
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/leibniz-de/app.min.css" />
<script src="https://contactform.bahlsengroup.com/leibniz-de/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/bahlsen-de/app.min.css" />
<script src="https://contactform.bahlsengroup.com/bahlsen-de/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/pickup-de/app.min.css" />
<script src="https://contactform.bahlsengroup.com/pickup-de/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/leibniz-at/app.min.css" />
<script src="https://contactform.bahlsengroup.com/leibniz-at/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/bahlsen-at/app.min.css" />
<script src="https://contactform.bahlsengroup.com/bahlsen-at/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/pickup-at/app.min.css" />
<script src="https://contactform.bahlsengroup.com/pickup-at/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/bahlsengroup-com-de/app.min.css" />
<script src="https://contactform.bahlsengroup.com/bahlsengroup-com-de/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/bahlsengroup-com-int/app.min.css" />
<script src="https://contactform.bahlsengroup.com/bahlsengroup-com-int/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/bahlsengroup-com-us/app.min.css" />
<script src="https://contactform.bahlsengroup.com/bahlsengroup-com-us/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>
<link rel="stylesheet" href="https://contactform.bahlsengroup.com/bahlsengroup-com-pl/app.min.css" />
<script src="https://contactform.bahlsengroup.com/bahlsengroup-com-pl/app.min.js"></script>
<div id="bahlsengroup_contactform" class="bootstrap"></div>