# Page Not Found

The URL `contracts-and-functions/read-and-write-functions/write-functions/transaction-prerequisites/approve-allowance` does not exist.

You might be looking for one of these pages:
- [approve() / allowance()](https://docs.carbondefi.xyz/contracts-and-functions/carboncontroller-functions/write-functions/transaction-prerequisites/approve-allowance.md)
- [Transaction Prerequisites](https://docs.carbondefi.xyz/contracts-and-functions/carboncontroller-functions/write-functions/transaction-prerequisites.md)
- [targetTokenSaleAmount()](https://docs.carbondefi.xyz/contracts-and-functions/carbonvortex-functions/read-functions/targettokensaleamount.md)
- [tradeByTargetAmount()](https://docs.carbondefi.xyz/contracts-and-functions/carboncontroller-functions/write-functions/trade/tradebytargetamount.md)
- [targetTokenPriceDecayHalfLife()](https://docs.carbondefi.xyz/contracts-and-functions/carbonvortex-functions/read-functions/targettokenpricedecayhalflife.md)

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