How can you determine who modified a customer's membership?

The method to determine who modified a customer's membership involves checking the audit trail button on the membership page. The audit trail is a feature designed to log all changes made to a membership, including details about who made the modification, what changes were made, and when these changes occurred. This functionality ensures accountability and provides a clear record of all adjustments to the membership, making it the most reliable source for tracking modifications.

While the other options may provide useful information, they do not offer the same level of clarity regarding modifications to memberships. Billing history might show transactions or payment records, but it does not typically indicate who made changes to the membership itself. Contacting customer support could provide answers, but it would not give direct access to the changes made or details surrounding those changes. Viewing the customer’s service agreement offers insights into the terms of service but doesn't track any modifications made after the initial agreement. Thus, using the audit trail is the most accurate approach for this purpose.