Universal Containers has two integrations to Salesforce; System A requires read-only accessto all Opportunity data...

Utilize a single "Integration User" with the "Modify All data" profile setting enabled so thatall integrations always have access to all data.

Utilize separate credentials and profiles for each integration, one having "view All" to ties and the other having "Modify All" to Accounts.

Use a single "Integration User" with profile settings restricted to "view All" for opportunity and "Modify All" for Accounts.

Utilize separate credentials for each system with both credentials having the "modify all data" permission on the profile.