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Hello Guys, I would like to check if a variable is a number. if the variable cointains more then a number like letters or , it should fail. can anybody help please?

Hello, I am using ZP 5.27.1.0 with + CapMonster 2 with SiteKey Addon. I added the "Recognize Recaptcha" Action in my template and I have entered the correct SiteKey and Domain. I can see CapMonster working correctly. The action in ZP gets a green check mark. But since i am a total beginner I do...