>AccessRule.Constraint</h2><section><p>Definition of a custom constraint. The supported keys are listed in the &ldquo;constraint and properties&rdquo; page.</p><table class=message-fields><thead><tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr></thead><tbody><tr id=AccessRule-Constraint-key><td><code>key</code></td><td><code>string</code></td><td><p>Key of the constraint.</p></td><td>No</td></tr><tr id=AccessRule-Constraint-values><td><code>values</code></td><td><code>string[]</code>