Problem integrating paypal

I have created a paypal API Key , API Indentifier
and and signature in my paypal account settings OrgUnit ID

However when I click connect I get the following message

Invalid Cardinal Commerce credentials – make sure to use production credentials

Is it manditory that i have a Cardinal commerce account or can i just not connect via paypal directly without Cardinal Commerce?

We have PayPal integrated and I have no idea what Cardinal Commerce is. So you certainly don’t need it! Should be able to go direct with PayPal.

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We experienced the same issue where the Cardinal Commerce error message would appear. The confusion was thinking that the API Key , API Indentifier, OrgUnit ID were related to our PayPal Pro account. THEY ARE NOT. I assume those API fields are for use if you have a Cardinal Commerce account.
Assuming you have PayPal Pro configured per the Snipcart notes. Just leave the API fields blank and select the connect button, and you should see the connection confirmation message.
Hope that helps.