The Wix platform uses an iframe technique for embedding custom HTML. So to embed Octany's classic widget, you need to add an HTML block with all the code together, e.g.:
<link rel="stylesheet" href="https://app.octany.com/[ACCOUNT_ID]/checkout/appearance">
<script src="https://app.octany.com/js/checkout.js?v=10"></script>
<style>
.octany-wrapper {
background: #fff;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 8px rgba(0, 0, 0, 0.06), 0 12px 24px rgba(0, 0, 0, 0.08);
max-width: 600px;
border: 1px solid #f3f4f4;
padding-bottom: 10px;
margin: 0 auto;
}
</style>
<div class="octany-wrapper">
<octany-widget
version="2"
url="https://app.octany.com"
account-id="[ACCOUNT_ID]"
product-id="[PRODUCT_ID_1]|[PRODUCT_ID_2]"
tab-title="Become a monthly donor|One-time donation"
page-title="Give a donation every month|Give a one-time donation"
type="iframe"
locale="en"
></octany-widget>
</div>
We may need to add a special exception for your Wix website. Feel free to add the code to a subpage and send us the address at Octany support and we'll sort it out.