Explain E20-3 evaluation please

With reference to : https://www.w3.org/2016/poe/wiki/Evaluator
I am seeking help to understand the case E20-3.
A detailed textual explanation would really help me.
The corresponding example in the ODRL specification
<https://www.w3.org/TR/odrl-model/> is as follows:

EXAMPLE 20

{
  "@context": "http://www.w3.org/ns/odrl.jsonld",
  "@type": "Agreement",
  "uid": "http://example.com/policy:42",
  "profile": "http://example.com/odrl:profile:09",
  "obligation": [{
      "assigner": "http://example.com/org:43",
      "assignee": "http://example.com/person:44",
      "action": [{
          "rdf:value": {
            "@id": "odrl:compensate"
          },
          "refinement": [
            {
              "leftOperand": "payAmount",
              "operator": "eq",
              "rightOperand": { "@value": "500.00", "@type": "xsd:decimal" },
              "unit": "http://dbpedia.org/resource/Euro"
            }]
        }]
    }]
}

thanks and regards

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