Refactor: Extract method: Relevant fields
Refactor: Extract method: Relevant fields

Not all the rates are relevant to the given chargeback. At this moment,
the field is calculated only if the given chargeback type is able to
carry on the result. In future, we may be able to calculate only those
fields/columns needed by user. Then this method will come in handy.

Using word fields vs. columns as it is common more common in the
chargeback's codebase now.

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