Do not export when not required

providers/bitcoin/providerImpl.go

@@ -59,7 +59,7 @@ func (p *Provider) GetBalances() ([]int, []string, error) {
 		satoshiBalance += addressResponse.ChainStats.FundedTxoSum - addressResponse.ChainStats.SpentTxoSum
 	}
 
-	fiatBalance, err := p.client.ConvertBTCToCAD(satoshiBalance)
+	fiatBalance, err := p.client.convertBTCToCAD(satoshiBalance)
 	if err != nil {
 		return balances, ynabAccountIDs, fmt.Errorf("failed to convert satoshi balance to fiat balance: %v", err)
 	}