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[@salesforce/b2c-tooling-sdk](../../../modules.md) / [operations/mrt](../index.md) / ProjectBackendOptions

# Interface: ProjectBackendOptions

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/project.ts:791](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/project.ts#L791)

Common backend-routing options shared by the backend-aware project operations.

## Extended by

- [`ListProjectsBackendOptions`](ListProjectsBackendOptions.md)
- [`CreateProjectBackendOptions`](CreateProjectBackendOptions.md)
- [`GetProjectBackendOptions`](GetProjectBackendOptions.md)
- [`UpdateProjectBackendOptions`](UpdateProjectBackendOptions.md)
- [`DeleteProjectBackendOptions`](DeleteProjectBackendOptions.md)

## Properties

### legacyAuth?

> `optional` **legacyAuth**: [`AuthStrategy`](../../../auth/interfaces/AuthStrategy.md)

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/project.ts:797](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/project.ts#L797)

Legacy API-key auth strategy. Optional; required only when the legacy backend actually runs.

***

### onFallback()?

> `optional` **onFallback**: (`reason`) => `void`

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/project.ts:801](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/project.ts#L801)

Invoked when `auto` falls back from SCAPI to legacy.

#### Parameters

##### reason

`string`

#### Returns

`void`

***

### onResolve()?

> `optional` **onResolve**: (`backend`) => `void`

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/project.ts:803](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/project.ts#L803)

Invoked with the backend that serves the call (for `-D` debug).

#### Parameters

##### backend

[`MrtBackend`](../type-aliases/MrtBackend.md)

#### Returns

`void`

***

### origin?

> `optional` **origin**: `string`

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/project.ts:799](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/project.ts#L799)

Legacy MRT API origin.

***

### preference

> **preference**: [`MrtBackendPreference`](../type-aliases/MrtBackendPreference.md)

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/project.ts:793](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/project.ts#L793)

Resolved `--mrt-backend` preference.

***

### scapiConnection?

> `optional` **scapiConnection**: [`ScapiMrtConnection`](ScapiMrtConnection.md)

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/project.ts:795](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/project.ts#L795)

SCAPI connection; when absent, `auto` uses legacy and `scapi` throws.