Summer ’22: External Services Updates

Check out some of the changes and enhancements to External Services in the Summer ’22 release!

Call External Services Registrations Natively from Apex

Now you can access External Services registered actions directly from Apex to tap into reusable functionality when writing Apex code. Previously, actions created through External Services were exposed exclusively for invocation through Flow or Einstein Bots.

Check out the Summer ’22 Release Readiness Live demo (starts at minute ~3:20) and Developers’ Blog for a simple walkthrough of how to use this functionality.

Make sure to check out the official Salesforce Help Docs: Invoke External Service Callouts Using Apex for more details!

Salesforce Developer Console

Update an Existing Schema Connected to Flow

If a registration is in use by a flow, now you can update it with a new, compatible API specification version. Previously, you couldn’t update a registered schema that was in use by a flow. If the new schema version isn’t compatible, the edit workflow notifies you which operations and schema objects are in use by which flows and by which Apex classes. With this information, you know which existing references are incompatible so that you can remove them before saving your updated registration.

For details about supported and non-supported changes, see the official Salesforce Help Docs: Appendix 1: Schema Update Considerations.

External Services: Edit Screen

Register More APIs

Now you can register an external service without manually editing the schema before registration to conform to the 80-character limit for derived operation and object developer names. This enables you to register more APIs with less friction!

Additional Details

For additional details, make sure to review the Summer 22′ Release Notes and keep the feedback coming in the External Services Trailblazer Community!

Learn MOAR in Spring ’22 with OpenAPI 3.0 Support for External Services

Check out all the enhancements you can look forward to with the Spring ’22 release!

External Services is a feature of the Salesforce Platform that empowers customers to connect Salesforce to external business actions and build process integrations without writing custom code.

UnofficialSF has a new Service Cloud Channels Section has added a new section devoted to Service Cloud channel functionality, which is increasingly driven by flow-based services.

Check it out here. If you know of a good post or page on the topic, don’t hesitate to let us know via the form on the home page.


Check out some of the changes and enhancements to External Services in the Winter ’22 release – supporting even larger API spec sizes (4MB!) and improving the registration workflow with rescoped limits!

Import MuleSoft Anypoint Platform APIs via External Services

Import your MuleSoft Anypoint Platform APIs in a few clicks. Previously, you needed to manually export your Open API 2.0 specifications from MuleSoft and import them into an external service. Now, all you need to do is select your MuleSoft Name Credentials and let Salesforce do the heavy lifting of importing your endpoints and converting them into actions.

Revised and Expanded Operation, Action, and Object Limits

You can register even more complex, publicly available API specifications. Most registration limits have been rescoped from a per API spec limitation to a per org limitation, and have been expanded.

Map Non-Standard Media Types in Your Registration

A Salesforce administrator, developer, or ISV can edit the compatible media type mappings in an external service registration for OpenAPI specifications with unknown or non-standard request or response media types.

For Winter ’22, we’ve provided a workaround. With the Metadata API, you can manipulate a registration and override the definition of the custom header.

External Services in Einstein Bot Builder

Add an external service’s action to your bot from the Bot Builder. Previously, you could only add an external service’s action to your bot via a flow.

Major Enhancements to the Trailhead Experience

Make sure to check out the newly revised External Services Trailhead module – we’ve made some major enhancements based on your feedback.

Additional Details

For additional details, make sure to review the Winter 22′ Release Notes!

Learn MOAR with Summer ’21: External Services Enhancements

Check out the announcement regarding all the improvements shipping in the Summer ’21 release!

Building AWS External Services

I haven’t had a chance to really dig into this topic, but was asked about it recently and thought I’d assemble some known information.

Creating a Named Credential for AWS Signature V4

Salesforce has GA support for this as a Named Credential type:

Testing AWS Named Credentials

Use code like this Apex code to verify that your Named Credential works:

HttpRequest req = new HttpRequest();
Http http = new Http();
HTTPResponse res = http.send(req);

Named Credential Setup:
AWS Region: us-east-1
AWS Service: ec2 (edited) 

It retrieves an image from an EC2 endpoint (you will have to set up your own EC2 endpoint or some similar thing!)

Also check out this blog post from ForcePanda.

Creating an External Service for AWS

Here’s an example of a set of AWS endpoints that have been successfully ingested as External Service Registrations

In the above example, I ingested the specification for the AWS API Gateway service. I found it at, a useful online library.

External Service recently extended the size of the specifications that can be ingested from 100k to 1megabyte. That was critical to enabling the above ingestion example, because it is about 700k in size.

There are other AWS specs that are larger than 1megabyte. For example, the AWS EC2 spec is 2.4 megabytes, and can’t be ingested as-is. However, it’s definitely possible to carve pieces of them out. It can be tricky because different parts of the spec depend on other parts. But usually, for a given service, there’s an 80/20 rule, and a small number of API’s carry most of the load. Salesforce does intend to increase the size of ingestable specifications.

Authorization Headers in AWS Specs

Salesforce External Services recently added support for Authorization Headers in its processing of Open API Specifications. AWS uses Authorization Headers extensively in its apis. Take as an example the DeleteApiKey api from above. In the specification you’ll find a listing of a bunch of authorization-related input parameters:

Like all input parameters, these then show up in the property editor of the resulting invocable action:

Note that in the spec above, these are defined as ‘components’. Further down, the ‘components’ section of the spec informs External Services that these are intended to be used as headers:

The invocable action code generated as part of the external service registration will take the inputs provided to the invocable action and form them into headers for the resulting callouts.

Learn about Apex-Defined Types: the Glue between External Services and Flow

This is the original material on Apex-defined Types. Excellent reading for External Services users.