Update Dart documentation

src/guide/buy_btc.md

@@ -68,7 +68,8 @@ try {
 ```dart
 try {
     BuyBitcoinResponse buyBitcoinResponse = buyBitcoin(
-        reqData: BuyBitcoinRequest(provider: BuyBitcoinProvider.Moonpay,
+        reqData: BuyBitcoinRequest(
+            provider: BuyBitcoinProvider.Moonpay,
         ),
     ); 
 } catch {

src/guide/fiat_currencies.md

@@ -109,7 +109,7 @@ try {
 
 ```dart
 try {
-    Map<String, Rate> fiatRatesMap = fetchFiatRates();
+    Map<String, Rate> fiatRatesMap = await fetchFiatRates();
     // print your desired rate 
     print(fiatRatesMap["USD"]?.value);
 } catch(e) {
@@ -201,7 +201,31 @@ fun fiatCurrenciesAndRate(): Map<FiatCurrency, Rate> = try {
 <section>
 
 ```dart
-// TODO
+Future<Map<FiatCurrency, Rate>> fiatCurrenciesAndRate() async {
+    try {
+      List<FiatCurrency> fiatCurrencies = await _breezLib.listFiatCurrencies();
+      Map<String, Rate> fiatRates = await _breezLib.fetchFiatRates();
+
+      var sorted = fiatCurrencies.toList();
+      sorted.sort((f1, f2) {
+        return f1.id.compareTo(f2.id);
+      });
+
+      Map<FiatCurrency, Rate> result = {};
+      for (var currency in sorted) {
+        var rate = fiatRates[currency.id];
+        if (rate != null) {
+          result[currency] = rate;
+        }
+      }
+
+      return result;
+    } catch (e) {
+      // Handle error
+      return {};
+    }
+}
+
 ```
 </section>
 

src/guide/payments.md

@@ -75,7 +75,7 @@ try {
 ```dart
 try {
     ReceivePaymentResponse invoice = await receivePayment(
-        reqData: ReceivePaymentRequestData(
+        reqData: ReceivePaymentRequest(
             amountSats: 3000, 
             description: "Invoice for 3000 sats",
         ),

src/guide/receive_onchain.md

@@ -68,7 +68,9 @@ try {
 
 ```dart
 try {
-    SwapInfo swapInfo = await receiveOnchain(ReceiveOnchainRequest());
+    SwapInfo swapInfo = await receiveOnchain(
+        reqData: ReceiveOnchainRequest(),
+    );
 
     // Send your funds to the below bitcoin address
     String address = swapInfo.bitcoinAddress;
@@ -175,7 +177,7 @@ try {
 
 ```dart
 try {
-    SwapInfo? swapInfo = await inProgressSwap()
+    SwapInfo? swapInfo = await inProgressSwap();
 } catch (error) {
     // handle error
 }
@@ -507,7 +509,8 @@ try {
 ```dart
 int amountMsats = <amount msats>
 try {
-    int channelFees = openChannelFee(OpenChannelFeeRequest(
+    int channelFees = openChannelFee(
+        req: OpenChannelFeeRequest(
             amountMsats: amountMsats,
         ),
     );

src/guide/send_onchain.md

@@ -275,6 +275,7 @@ try {
 String destinationAddress = "bc1..";
 int amountSat = <amount>;
 int satPerVbyte = <fee rate>
+ReverseSwapPairInfo currentFees = <current reverse swap fees>
 try {
     ReverseSwapInfo reverseSwapInfo = await sendOnchain(
         amountSat: amountSat,

src/guide/static_channel_backup.md

@@ -63,7 +63,11 @@ try {
 
 ```dart
 try {
-    StaticBackupResponse backupData = await staticBackup(request: StaticBackupRequest(workingDir: "<working directory>"));
+    StaticBackupResponse backupData = await staticBackup(
+        request: StaticBackupRequest
+            workingDir: "<working directory>",
+        ),
+    );
 } catch (error) {
    // handle error
 }