Access Users in Setup
In Salesforce Setup, search for Users in the Quick Find box, then select Users.
Create a New User
Click New User.
Complete the New User Form
Select the Salesforce Integration user license.
Choose the Salesforce API Only System Integrations profile.
Assign the Permission Set License
Assign the user the Salesforce API Integration permission set license.
Create a Permission Set
Create a custom permission set with the necessary object permissions.
Permission Set Assignments
Assign this permission set to the user.