> For the complete documentation index, see [llms.txt](https://financiyo.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://financiyo.gitbook.io/docs/smart-contracts/evm-extensions/authorization.md).
# Authorization
The user should grant authorization to allow smart contracts (including precompiled ones) to send messages on behalf of a user account. This is achieved by the `Authorization.sol` and `GenericAuthorization.sol` that provide the necessary functions to grant approvals and allowances. The precompiled contracts use these interfaces, `AuthorizationI` and `GenericAuthorizationI`, to allow users to approve the corresponding messages and amounts if needed.
### Solidity Interfaces[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#solidity-interfaces)
#### `Authorization.sol`[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#authorizationsol)
Find the [Solidity interface in the evmos/extensions repo](https://github.com/evmos/extensions/blob/main/precompiles/common/Authorization.sol).
#### `GenericAuthorization.sol`[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#genericauthorizationsol)
Find the [Solidity interface in the evmos/extensions repo](https://github.com/evmos/extensions/blob/main/precompiles/common/GenericAuthorization.sol).
### Transactions[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#transactions)
#### `Authorization.sol`[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#authorizationsol-1)
* `approve`
Approves a list of Cosmos or IBC transactions with a specific amount of tokens
```
function approve(
address spender,
uint256 amount,
string[] calldata methods
) external returns (bool approved);
```
* `increaseAllowance`
Increase the allowance of a given spender by a specific amount of tokens for IBC transfer methods or staking
```
function increaseAllowance(
address spender,
uint256 amount,
string[] calldata methods
) external returns (bool approved);
```
* `decreaseAllowance`
Decreases the allowance of a given spender by a specific amount of tokens for IBC transfer methods or staking
```
function decreaseAllowance(
address spender,
uint256 amount,
string[] calldata methods
) external returns (bool approved);
```
#### `GenericAuthorization.sol`[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#genericauthorizationsol-1)
* `approve`
Approves a list of Cosmos message
```
function approve(
address spender,
string[] calldata methods
) external returns (bool approved);
```
### Queries[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#queries)
#### `Authorization.sol`[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#authorizationsol-2)
* `allowance`
Returns the remaining number of tokens that the spender will be allowed to spend on behalf of the owner through IBC transfer methods or staking. This is zero by default
```
function allowance(
address owner,
address spender,
string calldata method
) external view returns (uint256 remaining);
```
### Events[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#events)
#### `Authorization.sol`[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#authorizationsol-3)
* `Approval`
This event is emitted when the allowance of a spender is set by a call to the `approve` method. The `value` field specifies the new allowance and the `methods` field holds the information for which methods the approval was set.
```
event Approval(
address indexed owner,
address indexed spender,
string[] methods,
uint256 value
);
```
* `AllowanceChange`
This event is emitted when the allowance of a spender is changed by a call to the decrease or increase allowance method. The `values` field specifies the new allowances and the `methods` field holds the information for which methods the approval was set.
```
event AllowanceChange(
address indexed owner,
address indexed spender,
string[] methods,
uint256[] values
);
```
#### `GenericAuthorization.sol`[](https://docs.evmos.org/develop/smart-contracts/evm-extensions/authorization#genericauthorizationsol-2)
* `Approval`
This event is emitted when the allowance of a spender is set by a call to the `approve` method. The `methods` field holds the information for which methods the approval was set.
```
event Approval(
address indexed owner,
address indexed spender,
string[] methods
);
```
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