Verisign Payflow Pro Failed merchant rule check Security Settings

I was working on a project which needs credit card transaction processing. I had this problem with the Verisign Payflow Pro: “Failed merchant rule check”. Google ain’t much helpful to solve the problem. Here is what you got to do:
Go to
Sign in with ur Verisign credentials. Don’t panic but paypal and verisign are working together like brothers.
Once you logged in, you can see a neat interface to administer ur account.
Click on ‘Account Administration’
Click on ‘Transaction Settings’ and the set the settings as follows to solve the above problem.

Maximum Amount per Transaction - blank
Maximum Amount for Credits - blank
Allow Non-referenced Credits - YES
Credits may exceed original transaction amount - YES
Allow reference transactions – NO

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I work with customers helping them achieve more using Microsoft Technologies. I am in my 9th year with Microsoft as of March 2020. I get to work with really smart people (both at Microsoft and Customers). Helping customers, removing any blockers, rapid prototyping is my core work.