# Open Position

* Function: `openPosition`
* The function implements the borrowing steps plainly: determine required collateral (`Base.prepareLeverage`), borrow liquidity (`decreaseLiquidity` and `collectLiquidity`), pay for fees (get `feeAmount`), swap (`Base.swap`), bookkeep (create a new `Lien.Info`).
* Storage: minimally required information of a position is stored in `liens`, which maps `[address, lienId]` into `Lien.Info`.