A skill gets a +3 bonus if it's a class skill. Do you only get the bonus once, or do you get the bonus for every rank put into the skill?
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You only get these bonuses once, the first time you put a rank into the skill (or the first time you take a level in a class that has it as a class skill, if you’d already had ranks in it).
Source: Pathfinder SRD – Class Skills