Merge pull request 'fixed fee polarity' (#101) from currency-100 into main

Reviewed-on: #101

api/billing/fees/internal/service/fees/internal/calculator/impl.go

@@ -109,7 +109,8 @@ func (c *quoteCalculator) Compute(ctx context.Context, plan *model.FeePlan, inte
 
 		entrySide := mapEntrySide(rule.EntrySide)
 		if entrySide == accountingv1.EntrySide_ENTRY_SIDE_UNSPECIFIED {
-			entrySide = accountingv1.EntrySide_ENTRY_SIDE_CREDIT
+			// Default fees to debit (i.e. charge the customer) when entry side is not specified.
+			entrySide = accountingv1.EntrySide_ENTRY_SIDE_DEBIT
 		}
 
 		meta := map[string]string{