Check List Membership on a Landing Page

Suppose you want to see if a Subscribers exists on a List in a Landing Page or Microsite Page in the Salesforce Marketing Cloud? I generally do that with SSJS for various reasons. It’s also possible to do it with AMPscript API functions. Bonus that it’s faster:

For more info:
Landing Pages
Microsites
AttributeValue()
RequestParameter()
Site-based AMPscript Functions
API AMPscript Functions
Using Complex Filter Parts

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