I gave up on this. The enhanced complexity of Zencart doesn't seem to make it an easy implementation, but Here is the complete notated Paypal code in case anybody wants their Zen-store to be one of the "Millions of online stores" able to offer their customers the immensely valuable ability to buy now and pay later at no risk to themselves.
Code:
PAYPAL Pay in 4 - Paylater
Copy the following code and paste between<head>...</head>on your page.
<script
src="https://www.paypal.com/sdk/js?client-id=YOUR_ID_HERE&components=messages"
data-namespace="PayPalSDK">
</script>
Copy the following code and paste between<body>...</body>on your page anywhere you'd like your messages to appear. We recommend placing them near the price of your products or cart amount.
<!--
In your code, update data-pp-amount
with the price or cart amount. For
example, data-pp-amount="89.99" for
a $89.99 product.
-->
<div
data-pp-message
data-pp-style-layout="text"
data-pp-style-logo-type="inline"
data-pp-style-text-color="black"
data-pp-amount="ENTER_VALUE_HERE">
</div>
Update the value fordata-pp-amountso that the SDK can display the most relevant messaging to your customers. For example, for a page with a $89.99 product, update it todata-pp-amount="89.99".
Save your code changes and publish them to your production environment.
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