To completely remove functionality flagged in a security review:
1. **Remove Components**: Delete associated components like Visualforce pages, Apex classes, or other elements from the package.
2. **Delete Related Code and Configurations**: Remove all code that references the flagged functionality, including external API references.
3. **Check Dependencies**: Validate that no dependencies exist on the flagged functionality.
4. **Disable or Comment Out**: If removal isn't feasible, ensure the code is no longer accessible or executable by disabling or commenting it out. However, commenting alone may not be sufficient.
5. **Delete Unused Code**: It's recommended to delete unused code entirely to avoid potential issues.
6. **Update the Package**: Make necessary updates to the package before resubmitting it for review.
7. **Seek Guidance**: If needed, consult your Partner Account Manager (PAM) or submit a case for further assistance.
For external API references specifically, verify that no external callouts or dependencies remain in the package.