Are any unallowed characters for the `MerchantDescriptor` parameter values, and how does AlphaCommerceHub handle them (silently strip them, or reject the payment API request at whole)?

Extensions AlphaCommerceHub
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1

The MerchantDescriptor parameter is documented on the «AlphaHPP» → «Request a Paypage Session» page:
This page does not mention any unallowed characters for the MerchantDescriptor parameter values:

Stripe, for example, enforces the following limitations:

The statement description must contain at least one letter, may not include <>"’ characters, and will appear on your customer’s statement in capital letters.
Non-ASCII characters are automatically stripped

Are any unallowed characters for the MerchantDescriptor parameter values, and how does AlphaCommerceHub handle them (silently strip them, or reject the payment API request at whole)?

2

I have got an answer from the AlphaCommerceHub support:

I’ve sent a request to my team to clarify, however I would suggest for this one it will be fairly conservative with something like:
a-z A-Z 0-9 and <space>