Buy Bitcoin (#398)

* Add fiat on-ramp service

* Use sdk-common MoonpayProvider

* Bump flutter qr dependency

* Bump sdk-common dependency

cli/src/commands.rs

@@ -54,6 +54,13 @@ pub(crate) enum Command {
         /// Amount the payer will send, in satoshi
         payer_amount_sat: u64,
     },
+    /// Generates an URL to buy bitcoin from a 3rd party provider
+    BuyBitcoin {
+        provider: BuyBitcoinProvider,
+
+        /// Amount to buy, in satoshi
+        amount_sat: u64,
+    },
     /// List incoming and outgoing payments
     ListPayments {
         /// The optional from unix timestamp
@@ -293,6 +300,37 @@ pub(crate) async fn handle_command(
             result.push_str(&build_qr_text(&bip21));
             result
         }
+        Command::BuyBitcoin {
+            provider,
+            amount_sat,
+        } => {
+            let prepare_res = sdk
+                .prepare_buy_bitcoin(&PrepareBuyBitcoinRequest {
+                    provider,
+                    amount_sat,
+                })
+                .await?;
+
+            wait_confirmation!(
+                format!(
+                    "Fees: {} sat. Are the fees acceptable? (y/N) ",
+                    prepare_res.fees_sat
+                ),
+                "Buy Bitcoin halted"
+            );
+
+            let url = sdk
+                .buy_bitcoin(&BuyBitcoinRequest {
+                    prepare_res,
+                    redirect_url: None,
+                })
+                .await?;
+
+            let mut result = command_result!(url.clone());
+            result.push('\n');
+            result.push_str(&build_qr_text(&url));
+            result
+        }
         Command::GetInfo => {
             command_result!(sdk.get_info().await?)
         }