[Codacy/BestPractice] Change this constant to a 'static' read-only property.

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Codacy Issue ID: 6a232e1d57b72593bdf08b8da4bcca0d

Field	Value
File	TransactionProcessing.MerchantFileProcessor/Configuration/TransactionFileFieldSources.cs
Line	7
Rule	BestPractice
Severity	Warning
Commit	bcad00618c8f4810aad04dbfafc002763540c4c9

Message: Change this constant to a 'static' read-only property.

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Code Snippet:

public const string ProductCode = "productcode";