diff --git a/src/guide/getting_started.md b/src/guide/getting_started.md
index edf3367..b0c007c 100644
--- a/src/guide/getting_started.md
+++ b/src/guide/getting_started.md
@@ -11,6 +11,10 @@ The Breez SDK provides the following services:
 
 Connecting to a node requires a seed (your master key). The seed is a bip39 mnemonic.
 
+## Pricing
+
+The Breez SDK is free for developers. 
+
 ## API Key and Invite Code
 
 Before you start, you will need an API Key to use the SDK, as well as an Invite Code when you create a new node.
diff --git a/src/guide/receive_onchain.md b/src/guide/receive_onchain.md
index a4e1554..021a2ac 100644
--- a/src/guide/receive_onchain.md
+++ b/src/guide/receive_onchain.md
@@ -2,7 +2,7 @@
 There are cases when you have funds in some bitcoin address and you would like to send those to your lightning node.
 
 In such cases, the SDK might have to open a new channel, for which case you can specify an optional user-selected
-channel opening fee[^1]. For simplicity, the examples below use the cheapest fee available.
+channel opening fee[^1].
 In order to receive funds you first have to be connected to an [LSP](connecting_lsp.md).
 
 <custom-tabs category="lang">
diff --git a/src/guide/send_payment.md b/src/guide/send_payment.md
index 6452e56..627ee44 100644
--- a/src/guide/send_payment.md
+++ b/src/guide/send_payment.md
@@ -15,11 +15,11 @@ Once you have outbound liquidity you can start sending payments too.
 <section>
 
 ```swift
-let bolt11 = "...";
 do {
-  // The `amountSats` param is optional so nil can be passed if the 
-  // bolt11 invoice spesifies an amount.
-  let payment = try sdk.sendPayment(bolt11: bolt11, amountSats: 3000)
+  // The `amountMsat` param is optional and should only passed if the bolt11 doesn't specify an amount.
+  // The amountMsat is required in case an amount is not specified in the bolt11 invoice'.
+  let req = SendPaymentRequest(bolt11: "...", amountMsat: 3000000)
+  let response = try sdk.sendPayment(req: req)
 } catch {
     // handle error
 }
@@ -32,7 +32,11 @@ do {
 ```kotlin,ignore
 val bolt11 = "..."
 try {
-    val payment = sdk.sendPayment(bolt11, 3000L.toULong())
+    // The `amountMsat` param is optional and should only passed if the bolt11 doesn't specify an amount.
+    // The amountMsat is required in case an amount is not specified in the bolt11 invoice'.
+    val amountMsat = 3000000L.toULong()
+    val req = SendPaymentRequest(bolt11, amountMsat)
+    val response = sdk.sendPayment(req)
 } catch (e: Exception) {
     // handle error
 }
@@ -61,9 +65,10 @@ try {
 ```python
 bolt11 = "..."
 try:
-  # The `amountSats` param is optional so None can be passed if the 
-  # bolt11 invoice spesifies an amount.
-  sdk_services.send_payment(bolt11=bolt11, amount_sats=None)
+  # The `amount_msat` param is optional and should only passed if the bolt11 doesn't specify an amount.
+  # The amount_msat is required in case an amount is not specified in the bolt11 invoice'.
+  req = breez_sdk.SendPaymentRequest(bolt11=bolt11, amount_msat=3000000)
+  sdk_services.send_payment(req=req)
 except Exception as error:
   # Handle error
 ```
@@ -74,9 +79,15 @@ except Exception as error:
 
 ```go
 bolt11 := "bolt11 invoice"
-amountSats := uint64(3000)
-if payment, err := sdk.SendPayment(bolt11, &amountSats); err == nil {
-    log.Printf("%#v", payment)
+// The `amountMsat` param is optional and should only passed if the bolt11 doesn't specify an amount.
+// The amountMsat is required in case an amount is not specified in the bolt11 invoice'.
+amountMsat := uint64(3000000)
+sendPaymentRequest := breez_sdk.SendPaymentRequest{
+    Bolt11: bolt11,
+    AmountMsat: amountMsat,
+}
+if response, err := sdk.SendPayment(sendPaymentRequest); err == nil {
+    log.Printf("%#v", response)
 }
 ```
 </section>
@@ -86,9 +97,12 @@ if payment, err := sdk.SendPayment(bolt11, &amountSats); err == nil {
 
 ```cs
 var bolt11 = "...";
+var amountMsat = 3000000;
 try 
 {
-    var payment = sdk.SendPayment(bolt11, 3000);
+    // The `amountMsat` param is optional and should only passed if the bolt11 doesn't specify an amount.
+    // The amountMsat is required in case an amount is not specified in the bolt11 invoice'.
+    var response = sdk.SendPayment(new SendPaymentRequest(bolt11, amountMsat));
 } 
 catch (Exception) 
 {