In this example, I created an integration user for HubSpot so my permission set name is HubSpot Integration User. However, make sure you align your permission set name with the name of the integration user you created. This is just an example.

Provide a Description for your permission set -  something like this. "Permission set exclusively assigned to the dedicated integration user for HubSpot &lt;&gt; Salesforce integration"

Select the "Salesforce API Integration" option next to License.

--None--
User Licenses
Analytics Cloud Integration User
Chatter External
Chatter Free
Customer Community
Customer Community Plus
High Volume Customer Portal
Identity
Sales Insights Integration User
Salesforce
Salesforce Integration
Salesforce Limited Access - Free
Salesforce Platform
SalesforceIQ Integration User
Permission Set Licenses
(Retired) Salesforce Mobile Chat Experience
Analytics Platform
Analytics Template Administration
Automated Actions
CRM User
Code Builder
Conversation Insights Integration User
Enablement Lite
Remote Data Cloud
Sales Console User
Sales Engagement
Sales Engagement Basic
Sales User
Salesforce API Integration
Slack Service User
Standard Einstein Activity Capture User
Trust Card Manager
Your Account App: Identity User

Afterwards, you'll be taken to the Permission Set configuration page. Provision the necessary permissions you'd like to grant to your dedicated integration user. In addition, provision the permissions that the integrated product requires. They should have those requirements documented in a help article. If not, consult with their support team or contact us for help.