---
schema_version: "1"
id: d16275576c461cee3ae01258ff52afe0af6886b34f0b96746b95d6762d725587
title: External Services Considerations
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/platform/264-0-0/enhanced_external_services_considerations.md
canonical_url: https://help.salesforce.com/s/articleView?id=platform.enhanced_external_services_considerations.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 87fc094df95f5ae2c365de6a2d098ac538157522c7e86ad18768eab0e213bd32
description: Here are the semantic, service, and usage constraints to keep in mind when integrating your services into External Services.
products:
  - Salesforce Platform
  - Security
release: "264"
---
# External Services Considerations

Here are the semantic, service, and usage constraints to keep in mind when integrating your services into External Services.

- **[OpenAPI 2.0 and 3.0 Support](https://help.salesforce.com/s/articleView?id=platform.external_services_intro_openapi_2_3_support.htm&release=264.0.0&type=5)**  
    Learn about valid API schema components that can be used to register a spec successfully.
- **[Authentication](https://help.salesforce.com/s/articleView?id=platform.external_services_intro_authentication.htm&release=264.0.0&type=5)**  
    To authenticate, External Services uses defined authentication parameters in Named Credentials.
- **[Schema Definition Support](https://help.salesforce.com/s/articleView?id=platform.external_services_intro_schema_definitions.htm&release=264.0.0&type=5)**  
    Learn about External Services' schema limits and other considerations.
- **[Schema Update Support](https://help.salesforce.com/s/articleView?id=platform.external_services_appendix_update_schema.htm&release=264.0.0&type=5)**  
    You can register an updated schema version that includes _supported_ changes to active and inactive components. This section provides details about whether changes are supported.

#### See Also

- [External Services OpenAPI 2.0 Schema](https://help.salesforce.com/s/articleView?id=platform.external_services_schema_examples.htm&release=264.0.0&type=5 "This section features External Services OpenAPI 2.0 schema examples.")
- [External Services OpenAPI 3.0 Schema](https://help.salesforce.com/s/articleView?id=platform.external_services_examples_openapi_3_0.htm&release=264.0.0&type=5 "This section features External Services OpenAPI 3.0 schema examples.")
- [Using the Schema Examples](https://help.salesforce.com/s/articleView?id=platform.external_services_examples_using.htm&release=264.0.0&type=5 "See how the respective Open API 2.0 and 3.0 examples are implemented with Apex.")