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

# Function: setEnvVarWithBackend()

> **setEnvVarWithBackend**(`options`): `Promise`\<[`MrtEnvVarWriteResult`](../interfaces/MrtEnvVarWriteResult.md)\>

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/env-var.ts:641](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/bceb8da43dd8bc63d57932bbd905d36a1b40c949/packages/b2c-tooling-sdk/src/operations/mrt/env-var.ts#L641)

Sets a single environment variable, routing to the SCAPI or legacy backend
per the given preference (with safe `auto` fallback).

## Parameters

### options

[`SetEnvVarBackendOptions`](../interfaces/SetEnvVarBackendOptions.md)

## Returns

`Promise`\<[`MrtEnvVarWriteResult`](../interfaces/MrtEnvVarWriteResult.md)\>