[AlphaCommerceHub] How to enable the «ACHSecure Tokenization service» for a merchant account? (to get `SecureToken` in an AlphaHPP response)

The documentation says:

Parameter Name Type Format Mandatory Description
SecureToken Alpha O If the merchant is using the ACHSecure Tokenization service a storage token is returned


I have got a response from AlphaCommerceHub:

Tokenization can be enabled on the Merchant Configuration tab.
I have added that now and returns a token in the response.