Hi,
This plugin was created around 7 years ago.
It seems the developer documentation on your link is for a newer API.
So I'm not sure of the situation.
We didn't get much feedback on this plugin in the past few years, so it might be that Intuit doesn't support the API used by this plugin, or maybe it only supports it for existing merchants already using it.
The first thing would be to check with a tech support at Intuit about the API using the entry point transactions.innovativegateway.com/servlet/com.gateway.aai.Aai (which is what this plugin uses).
If it's still available, they'll be able to provide you with the credentials or with the method to get them.
HIKASHOP ESSENTIAL 49,95€The basic version. With the main features for a little shop.
HIKAMARKETAdd-on Create a multivendor platform. Enable many vendors on your website.
HIKASERIALAdd-on Sale e-tickets, vouchers, gift certificates, serial numbers and more!
MARKETPLACEPlugins, modules and other kinds of integrations for HikaShop
HIKAAUCTION 40€Add-on Create auctions and let your customers bid for products.
ACCESS THE CHECKOUTClick here to access the payment area
