> ## Documentation Index
> Fetch the complete documentation index at: https://crossmint-devin-1787949784-wallet-docs-two-concept-model.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Callbacks

> **Callbacks** = `object`

Defined in: [packages/wallets/src/wallets/types.ts:200](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/wallets/types.ts#L200)

## Properties

### onAuthRequired()?

> `optional` **onAuthRequired**: (`signerType`, `signerLocator`, `needsAuth`, `sendOtp`, `verifyOtp`, `reject`) => `Promise`\<`void`>

Defined in: [packages/wallets/src/wallets/types.ts:203](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/wallets/types.ts#L203)

#### Parameters

| Parameter       | Type                          |
| --------------- | ----------------------------- |
| `signerType`    | `"email"` \| `"phone"`        |
| `signerLocator` | `string`                      |
| `needsAuth`     | `boolean`                     |
| `sendOtp`       | () => `Promise`\<`void`>      |
| `verifyOtp`     | (`otp`) => `Promise`\<`void`> |
| `reject`        | () => `void`                  |

#### Returns

`Promise`\<`void`>

***

### onTransactionStart()?

> `optional` **onTransactionStart**: () => `Promise`\<`void`>

Defined in: [packages/wallets/src/wallets/types.ts:202](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/wallets/types.ts#L202)

#### Returns

`Promise`\<`void`>

***

### onWalletCreationStart()?

> `optional` **onWalletCreationStart**: () => `Promise`\<`void`>

Defined in: [packages/wallets/src/wallets/types.ts:201](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/wallets/types.ts#L201)

#### Returns

`Promise`\<`void`>