> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Reedeeming Tokens

Once a condition has had it's payouts reported (ie by the UMACTFAdapter calling `reportPayouts` on the CTF contract), users with shares in the winning outcome can redeem them for the underlying collateral. Specifically, users can call the `redeemPositions` function on the CTF contract which will burn all valuable conditional tokens in return for collateral according to the reported payout vector. This function has the following parameters:

* `collateralToken`: IERC20 - The address of the positions' backing collateral token.
* `parentCollectionId`: bytes32 - The ID of the outcome collections common to the position being redeemed. Null in Polymarket case.
* `indexSets`: uint\[] - The ID of the condition to redeem.
* `indexSets`: uint\[] - An array of disjoint index sets representing a nontrivial partition of the outcome slots of the given condition. E.G. A|B and C but not A|B and B|C (is not disjoint). Each element's a number which, together with the condition, represents the outcome collection. E.G. 0b110 is A|B, 0b010 is B, etc. In the Polymarket case 1|2.