To integrate with an external system, Salesforce needs to have objects and fields that can store the data that will be sent from the external system via an API. These objects and fields should match the data structure and format of the external system as much as possible. Additionally, Salesforce needs to have an integration user and anintegration profile that can enable the connection between Salesforce and the external system. The integration user is a dedicateduser account that has access to the API and can perform data operations on behalf of other users. The integration profile is a custom profile that defines the permissions and settings for the integration user.