`/investments/refresh` is an optional endpoint for users of the Investments product. It initiates an on-demand extraction to fetch the newest investment holdings and transactions for an Item. This on-demand extraction takes place in addition to the periodic extractions that automatically occur one or more times per day for any Investments-enabled Item. If changes to investments are discovered after calling `/investments/refresh`, Plaid will fire webhooks: [`HOLDINGS: DEFAULT_UPDATE`](https://plaid.com/docs/api/products/investments/#holdings-default_update) if any new holdings are detected, and [`INVESTMENTS_TRANSACTIONS: DEFAULT_UPDATE`](https://plaid.com/docs/api/products/investments/#investments_transactions-default_update) if any new investment transactions are detected. This webhook will typically not fire in the Sandbox environment, due to the lack of dynamic investment transactions and holdings data. To test this webhook in Sandbox, call `/sandbox/item/fire_webhook`. Updated holdings and investment transactions can be fetched by calling `/investments/holdings/get` and `/investments/transactions/get`. Note that the `/investments/refresh` endpoint is not supported by all institutions. If called on an Item from an institution that does not support this functionality, it will return a `PRODUCT_NOT_SUPPORTED` error. As this endpoint triggers a synchronous request for fresh data, latency may be higher than for other Plaid endpoints (typically less than 10 seconds, but occasionally up to 30 seconds or more); if you encounter errors, you may find it necessary to adjust your timeout period when making requests. `/investments/refresh` is offered as an add-on to Investments and has a separate [fee model](https://plaid.com/docs/account/billing/#per-request-flat-fee). To request access to this endpoint, submit a [product access request](https://dashboard.plaid.com/team/products) or contact your Plaid account manager.