User Self-Purchase Detection in Marketplace

I'm seeking a data analyst or developer to help identify self-purchases in my marketplace.

Key Requirements:
- Analysis of purchase data to detect frequent transactions from the same user accounts.
- Identification of high volume purchases within short timeframes.

Data Available:
- IP Address
- Payment Method
- Device ID

Please note, the method of user identification has not been specified. Your expertise in handling such scenarios will be crucial.

Ideal Skills:
- Experience in data analysis within eCommerce or marketplace environments.
- Proficiency in tracking and interpreting data from multiple sources.
- Ability to identify and explain suspicious patterns.