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1. Vishkanya have Poison Use because they produce their own poison. Neither PFS rules nor logic support them buying manufactured poisons unless they have levels in the classes that normally have this benefit, or access from a Chronicle. If a vishkanya obtains a manufactured poison, her Poison Use ability works as written.
2. The rules don't support an animal's venom working effectively if applied directly to a weapon, though a non-PFS GM could allow it as a house rule. It must be prepared as a manufactured injury poison. edit: Outside of PFS, a character might use it as raw material for Craft (alchemy), applying a suitable Profession check for how much raw material it provides in gold piece value, but that's not explicit anywhere. In PFS, a day job roll against Profession (animal keeper) followed by a Craft (alchemy) roll provided you are an alchemist or investigator would do something like this, producing one of the permitted standard types of poison.
