sagepay authenticate error "payment type is invalid"

[johking]

Since updating the old Protx URLs, I have a problem with SagePay Txtype.

Set to PAYMENT it works fine:

$sHiddenValues .= "<INPUT TYPE=HIDDEN NAME=\"TxType\" VALUE=\"PAYMENT\">\n";

Set to AUTHENTICATE (which is what is required by the site owner), I have a problem:

$sHiddenValues .= "<INPUT TYPE=HIDDEN NAME=\"TxType\" VALUE=\"AUTHENTICATE\">\n";

The error message when purchasing is this:
Status: INVALID
Status Detail: 3014 : The TxType or PaymentType is invalid.

SagePay says that Authenticate is set up on the account.

Has anyone had this before or have any ideas on how to proceed?

[johking]

OK - I've found the problem is with the Protocol being 2.20 instead of 2.22

I had reinstalled Actinic after a computer change forgetting that I had downloaded an upgrade patch to v7.07

The change I made to get the correct Sage Pay payment URLs caused the old protocol to be uploaded and stopped the Authenticate working any more.

Grrr. Now I will have to try to find that upgrade patch somewhere.