Creation of the Merchant Catergory Codes under the setup Manage Merchant Catergory Codes

Summary: Merchant Category rules already map MCC codes to card expense types and Card expense types are mapped to Expense types in the template, is it still manadetory to configure anything separately under Manage Merchant Category codes?

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We haven't received any MCC codes from the Client. The question is whether it's necessary to create MCC codes under Manage Merchant Category codes, given that we already have 891 seeded in the Manage Corporate Card Expense type Mapping rules, which are mapped to Card expense types and eventually these card expense types will be mapped to the expense types in the template.