documentation for batch modify

docs/contracts/v4/guides/02-manage-liquidity/06-batch-liquidity.mdx

@@ -1,3 +1,79 @@
 ---
 title: Batch Modify
----
+---
+
+### Context
+
+As seen in previous guides, `PositionManager` is a command-based contract. This design is conducive to 
+batching complex liquidity operations. For example, developers can encode efficient logic to move
+liquidity between two positions on entirely different Pools. 
+
+### Setup
+
+See the [setup guide](./00-setup-liquidity.mdx)
+
+# Guide
+
+Below is a general reference guide for batch-operating on multiple liquidity positions, in *solidity*.
+This guide does _not_ focus on a specific batch sequence, and is intended to be a general guide for `PositionManager`'s command-based interface.
+
+### 1. Encoded Actions
+
+Actions are divided into two types: _liquidity-operations_ and _delta-resolving_.
+
+* _liquidity-operations_ - actions which that incur a *balance-change*, a change in the pool's liquidity
+* _delta-resolving_ - actions which facilitate token transfers, such as _settling_ and _taking_
+
+The _ordering_ of `actions` determines the sequence of operations. The minimum number of actions is roughly two actions; and the maximum is limited by block gas limit.
+Additionally, _liquidity-operations_ do not have to happen prior to _delta-resolving_ actions. Developers can mix / alternate between
+the two types of actions.
+
+> **However** is good practice to perform _liquidity-operations_ before _delta-resolving_ actions. Minimizing token transfers
+and leveraging [_flash accounting_](../../concepts/02-flash-accounting.mdx) is more gas efficient
+
+Example: `Action.Y` happens after `Action.X` but before `Action.Z`
+```solidity
+import {Actions} from "v4-periphery/src/libraries/Actions.sol";
+
+bytes memory actions = abi.encodePacked(uint8(Actions.X), uint8(Actions.Y), uint8(Actions.Z), ...);
+```
+
+**A Note on Special Actions**:
+
+`PositionManager` supports a few _delta-resolving_ actions beyond the standard `SETTLE` and `TAKE` actions
+
+* `CLOSE_CURRENCY` - automatically determines if a currency should be settled (paid) or taken. Used for cases where callers may not know the final delta
+* `CLEAR_OR_TAKE`- forfeit tokens if the amount is below a specified threshold, otherwise take the tokens. Used for cases where callers may expect to produce dust
+* `SWEEP` - return any excess token balances to a recipient. Used for cases where callers may conversatively overpay tokens
+
+### 2. Encoded Parameters
+
+Each action has its own parameters to encode. Generally:
+
+* _liquidity-operations_ - encode tokenIds, liquidity amounts, and slippage
+
+* _delta-resolving_ - encode currencies, amounts, and recipients
+
+Because actions are ordered, the parameters "zip" with their corresponding actions. The second parameter corresponds to the second action.
+Every action has its own encoded parameters
+
+```solidity
+bytes[] memory params = new bytes[](3);
+
+params[0] = abi.encode(...); // parameters for the first action
+params[1] = abi.encode(...); // parameters for the second action
+params[2] = abi.encode(...); // parameters for the third action
+```
+
+### 3. Submit Call
+
+The entrypoint for all liquidity operations is `modifyLiquidities()`
+
+```solidity
+uint256 deadline = block.timestamp + 60;
+
+posm.modifyLiquidities(
+    abi.encode(actions, params),
+    deadline
+);
+```