# Data. How to get the best results

#### Data Richness

* The quality and amount of transaction data has a **big impact** on the accuracy of results. The data available may vary at different stages of processing (e.g. Pending, Pre-authorised, Authorised but not posted)
* You should attempt to include as many input fields as possible in your requests to MRS. See the [openapi-docs](https://devs.snowdropsolutions.co.uk/openapi-docs "mention") for the fields we support. All are valuable, but the most valuable are, in order:
  * `country`
  * `mcc` (see [merchant-category-codes](https://devs.snowdropsolutions.co.uk/basic-concepts/merchant-category-codes "mention"))
  * `city`
  * `location`
  * (This is in addition to the `merchant_name` and `type` parameters, which are both mandatory).

#### Data Notes

* MRS requires information about the merchant involved in the transaction.
* MRS does not process end-user personal data
* The collected data may be “messy” and not all fields may be available for all transactions. 
* Often only one single field with location is available. Also, the merchant description may include location information.