[BirdOPrey5]

Well you basically have

condition="XXX"

Where XXX is something like:

$post['signature'] == 'Value'

or such.

You just need to add additional statements with AND or OR depending on what you want.

Use parentheses to keep the logic correct/easy to follow

condition="(XXX) OR ((YYY) AND (ZZZ))"

For example... if XXX is true OR if YYY and ZZZ are true regardless of the value of XXX.