Validtation tool or recommendation process

We have a project and determining if the validation process should be done in webMethods IS or not. At a high-level, this project will use an ETL tool to load the data into a database. The next process is to validate the content of the data and each partner will have its own unique validation requirements. It can be simple or complex based on the partner. Does anyone have any recommendation on whether this should be in using IS/TN or does wM have a specific product that would greatly make this more “effortless.”.

Can you please elaborate on the validation process.