[AlphaCommerceHub] The maximum length of a payment description (`TxnDetails`) is 2000 characters

The TxnDetails parameter is documented on the «AlphaHPP» → «Request a Paypage Session» page.
This page says that the TxnDetails parameter accepts up to 2000 characters:

Today I have got a comment from the AlphaCommerceHub team:

This field is only accepting alphanumerics. The brackets are not supported.
We will look to extend this field for special characters but for now please remove the brackets and comma from your test string

See also: