HTTP Callout from Flow Builder
Key Takeaway
HTTP Callout lets a flow call an external API without code. In a record-triggered flow, put the callout on an asynchronous path, because a callout on the synchronous run path fails.
HTTP Callout is a Flow Builder action that lets a flow call an external HTTP-based or REST API without writing code. You don't need a developer or middleware tool. You describe the API endpoint and give sample JSON. Flow Builder then generates an external service registration, an invocable action and Apex classes, so the flow can send data out or use the response data in Salesforce.
When to use HTTP Callout
Use HTTP Callout when a flow must talk to an external API that has no connector. Examples include:
- Calling a maps API in real time from a screen flow to show address details and business hours
- Running a daily check with a weather service
- Verifying with a payment processor that a payment has cleared
- Adding leads and contacts to an external marketing tool