jQuery credit card input format

I want to use jQuery validation for credit card input fields. When I seach for it I saw most people made this happen with additional validation methods.

I tried adding this to my code :

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/additional-methods.js"></script>

or this code :

jQuery.validator.addMethod("lettersonly", function(value, element) {
  return this.optional(element) || /^[a-z]+$/i.test(value);
}, "Letters only please");

But I’m getting this error

enter image description here

Is this about a version problem, I use the jQuery 3.6 version and tried 1.7 and 1.9 versions for validation plugin.

Note: I’m sure that I use validation plugin after adding jQuery cdn. I can reach jQuery but not to jQuery.validator method.

Addition: I’m tring to format name-surname input field with only letters and spaces. If you can help me with that too, I would be glad.(Or is there a plugin prepared for every input field for credit card inputs.)