[RPG] Where did the ability “Paper cut” come from

Yes, it does: a Mirror of Suggestion:

This small hand mirror manifests its power up to twice per day against creatures that see their reflections within it, as a gaze attack with a range of 30 feet. Potential victims can attempt to avert their eyes or look away as they would from a normal gaze attack. A creature meeting its own gaze in the mirror must succeed on a DC 13 Will save or be affected by a suggestion chosen by the mirror’s wielder.

The suggestion encoded is "I have a right to be here as a duly appointed representative of your superiors. Tell me who I am."

Or, much the same can be done with a potion of glibness, as in fantasy settings, authority isn't vested in paper, but in recognized people.

Or, barring that, you could be a level 1 binder (on top of whatever else you were, probably factotum/bard) having bound naberius, and just use disguise self to disguise yourself as someone who is appropriate to be there. (I note naberius qua binder rather than a normal spellcaster because a binder can keep this charade up all day at very low levels without excessive resource use.)

Or, barring that, you could be a diplomancer and just cause whomever you speak with to become fanatically aligned with your interests.

Or, barring that, have a piece of paper with "I prepared explosive runes today" written on it. It's the ultimate password.

Paizo has no official concept of “rune magic,” rather both arcane and divine magics can create glyphs, runes, sigils, and symbols that have various effects. For some examples,

• Sorcerers and wizards, as well as anyone with the rune domain, can cast the explosive runes spell, which creates runes that, well, explode when read.

• Clerics, inquisitors, oracles, and witches can cast the glyph of warding spell, which harms those who attempt to bypass it.

• Clerics, oracles, sorcerers, witches, and wizards can cast the symbol of death spell, which kills those who are too close to it when it is triggered (typically by looking at it, reading it, touching it, or passing over or under it).

The rune domain includes many of these sorts of spells, and would be quite fitting for a character who is supposed to be particularly interested in runic magic. But ultimately, that character would just be a regular spellcaster who favors certain spells that share a theme, not someone who uses a special or unique type of magic.

For a more unusual sort of rune, there are the sin runes, which are basically a special sort of magic item, of which a character can have only one and can activate it with a command word as a standard action. They can be created using the Inscribe Rune item-creation feat, which is available to any spellcaster with caster level 3rd, but the prices of the runes are much too high to consider for a character of that level (the cheapest, by a lot, are the rune of the inscrutable one, at 36,000 gp and the rune of resistance at 45,000 gp; the next cheapest is the rune of razing at 91,000 gp and the rest are all above 100,000 gp). Thus, Inscribe Rune is probably only worth considering at quite high levels, and only if a couple of people in the party would otherwise pay full price for a sin rune.

Finally, third-party book Ultimate Psionics includes a variant on page 142 for treating their psionics rules as rune magic, by simply renaming things. It’s a rather interesting take that I enjoy much more than the above.