Final answer:
AWS Kinesis Data Streams is the service that allows processing of clickstream data in the same order, which is suitable for running both billing process and auditing in a regulated industry within 7 days.
Step-by-step explanation:
The Amazon Web Services (AWS) offering that best meets the requirement of running the billing process and auditing process on the given clickstream data in the same order is AWS Kinesis Data Streams. AWS Kinesis Data Streams provides real-time data streaming and can handle high-throughput, distributed data processing. This service maintains the order of the records, ensuring that clickstream data is processed sequentially as it's ingested, fulfilling the requirement for ordered clickstream data for auditing purposes. Additionally, because Kinesis Data Streams integrates well with other AWS services, it can facilitate both the billing and auditing processes within the stipulated 7-day window.