diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a7d2c4..eb5d8c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.10.0 (18.05.2023)
+
+- [Soroban.ex improvements](https://github.com/kommitters/soroban.ex/issues/84)
+
 ## 0.9.0 (18.05.2023)
 
 - [Retrieve unsigned transactions](https://github.com/kommitters/soroban.ex/issues/70)
diff --git a/README.md b/README.md
index 7dbd302..19985ae 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@
 ```elixir
 def deps do
   [
-    {:soroban, "~> 0.9.0"}
+    {:soroban, "~> 0.10.0"}
   ]
 end
 ```
@@ -466,6 +466,14 @@ The deployment and invocation of Soroban smart contracts is done through the `So
 
 #### Invoke contract function
 
+**Parameters**
+
+- `contract_id`: Identifier of the contract to be invoked.
+- `source_secret_key`: Secret key of the function invoker responsible for signing the transaction.
+- `function_name`: String indicating the name of the function to be invoked.
+- `function_args`: List of `Soroban.Types` representing the arguments required by the indicated function (`function_name`). They should be provided in the specific order expected by the function.
+- `auth_secret_key`: (optional) Secret key used to authorize the function invocation when the function invoker is not the same function authorizer.
+
 ##### Simple invocation - no authorization required
 
 ```elixir
@@ -492,7 +500,7 @@ Contract.invoke(contract_id, source_secret_key, function_name, function_args)
 
 ##### Invocation with required authorization
 
-- When the invoker is the signer
+- When the function invoker authorizes the function invocation
 
   ```elixir
   alias Soroban.Contract
@@ -519,7 +527,7 @@ Contract.invoke(contract_id, source_secret_key, function_name, function_args)
     }}
   ```
 
-- When the invoker is not the signer
+- When the function invoker is not the function authorizer.
 
   ```elixir
   alias Soroban.Contract
@@ -535,9 +543,9 @@ Contract.invoke(contract_id, source_secret_key, function_name, function_args)
     Int128.new(4500)
   ]
 
-  auth_accounts = ["SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK"]
+  auth_secret_key = "SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK"
 
-  Contract.invoke(contract_id, source_secret_key, function_name, function_args, auth_accounts)
+  Contract.invoke(contract_id, source_secret_key, function_name, function_args, auth_secret_key)
 
   {:ok,
     %Soroban.RPC.SendTransactionResponse{
@@ -553,6 +561,11 @@ Contract.invoke(contract_id, source_secret_key, function_name, function_args)
 
 ##### Install Contract Code
 
+**Parameters**
+
+- `wasm`: Binary of the web assembly (WASM) file resulting from building the contract.
+- `secret_key`: Secret key of the function invoker responsible for signing the transaction.
+
 ```elixir
 alias Soroban.Contract
 alias Soroban.RPC.SendTransactionResponse
@@ -582,6 +595,11 @@ wasm_id =
 
 ##### Deploy Contract from WASM
 
+**Parameters**
+
+- `wasm_id`: Binary identification of the installed contract to deploy.
+- `secret_key`: Secret key of the function invoker responsible for signing the transaction.
+
 ```elixir
 alias Soroban.Contract
 alias Soroban.RPC.SendTransactionResponse
@@ -610,6 +628,11 @@ hash
 
 ##### Deploy Asset Contract
 
+**Parameters**
+
+- `asset_code`: String from 1 to 12 characters indicating the asset symbol.
+- `secret_key`: Secret key of the function invoker responsible for signing the transaction.
+
 ```elixir
 alias Soroban.Contract
 alias Soroban.RPC.SendTransactionResponse
@@ -644,6 +667,13 @@ This XDR is required by wallets to sign transactions before they can be submitte
 
 #### Invoke contract function
 
+**Parameters**
+
+- `contract_id`: Identifier of the contract to be invoked.
+- `source_public_key`: Public key of the function invoker responsible for signing the transaction.
+- `function_name`: String value indicating the name of the function to be invoked.
+- `function_args`: List of `Soroban.Types` representing the arguments required by the indicated function (`function_name`). They should be provided in the specific order expected by the function.
+
 ```elixir
 alias Soroban.Contract
 alias Soroban.Types.Symbol
@@ -667,6 +697,11 @@ Contract.retrieve_unsigned_xdr_to_invoke(
 
 #### Install contract code
 
+**Parameters**
+
+- `wasm`: Binary of the web assembly (WASM) file resulting from building the contract.
+- `source_public_key`: Public key of the function invoker responsible for signing the transaction.
+
 ```elixir
 alias Soroban.Contract
 
@@ -681,6 +716,11 @@ Contract.retrieve_unsigned_xdr_to_install(wasm, source_public_key)
 
 #### Deploy Contract
 
+**Parameters**
+
+- `wasm_id`: Binary identification of the installed contract to deploy.
+- `source_public_key`: Public key of the function invoker responsible for signing the transaction.
+
 ```elixir
 alias Soroban.Contract
 
@@ -696,6 +736,11 @@ Contract.retrieve_unsigned_xdr_to_deploy(wasm_id, source_public_key)
 
 #### Deploy Asset Contract
 
+**Parameters**
+
+- `asset_code`: String from 1 to 12 characters indicating the asset symbol.
+- `source_public_key`: Public key of the function invoker responsible for signing the transaction.
+
 ```elixir
 alias Soroban.Contract
 
diff --git a/lib/contract.ex b/lib/contract.ex
index 4de5ae0..835eaa4 100644
--- a/lib/contract.ex
+++ b/lib/contract.ex
@@ -15,7 +15,7 @@ defmodule Soroban.Contract do
                 source_secret_key,
                 function_name,
                 function_args \\ [],
-                auth_accounts \\ []
+                auth_secret_key \\ nil
               ),
               to: InvokeContractFunction,
               as: :invoke
diff --git a/lib/contract/invoke_contract_function.ex b/lib/contract/invoke_contract_function.ex
index b189ece..e35a0df 100644
--- a/lib/contract/invoke_contract_function.ex
+++ b/lib/contract/invoke_contract_function.ex
@@ -19,7 +19,7 @@ defmodule Soroban.Contract.InvokeContractFunction do
 
   @type account :: Account.t()
   @type function_args :: list(struct())
-  @type auth_accounts :: list(binary())
+  @type auth_secret_key :: binary() | nil
   @type invoke_host_function :: InvokeHostFunction.t()
   @type envelope_xdr :: String.t()
   @type function_name :: String.t()
@@ -36,14 +36,14 @@ defmodule Soroban.Contract.InvokeContractFunction do
           source_secret_key :: source_secret_key(),
           function_name :: function_name(),
           function_args :: function_args(),
-          auth_accounts :: auth_accounts()
+          auth_secret_key :: auth_secret_key()
         ) :: send_response()
   def invoke(
         contract_id,
         source_secret_key,
         function_name,
         function_args,
-        auth_accounts \\ []
+        auth_secret_key \\ nil
       ) do
     with {public_key, _secret} = keypair <- Stellar.KeyPair.from_secret_seed(source_secret_key),
          {:ok, seq_num} <- Accounts.fetch_next_sequence_number(public_key),
@@ -52,8 +52,7 @@ defmodule Soroban.Contract.InvokeContractFunction do
          %Account{} = source_account <- Account.new(public_key),
          %SequenceNumber{} = sequence_number <- SequenceNumber.new(seq_num),
          %InvokeHostFunction{} = invoke_host_function_op <-
-           create_host_function_op(contract_id, function_name, function_args),
-         auth_account <- Enum.at(auth_accounts, 0) do
+           create_host_function_op(contract_id, function_name, function_args) do
       invoke_host_function_op
       |> RPCCalls.simulate(source_account, sequence_number)
       |> RPCCalls.send_transaction(
@@ -61,7 +60,7 @@ defmodule Soroban.Contract.InvokeContractFunction do
         sequence_number,
         signature,
         invoke_host_function_op,
-        auth_account
+        auth_secret_key
       )
     end
   end
diff --git a/lib/contract/rpc_calls.ex b/lib/contract/rpc_calls.ex
index b0b81ff..7a14ab6 100644
--- a/lib/contract/rpc_calls.ex
+++ b/lib/contract/rpc_calls.ex
@@ -17,7 +17,7 @@ defmodule Soroban.Contract.RPCCalls do
 
   @type account :: Account.t()
   @type auth :: String.t() | nil
-  @type auth_account :: String.t() | nil
+  @type auth_secret_key :: String.t() | nil
   @type envelope_xdr :: String.t()
   @type invoke_host_function :: InvokeHostFunction.t()
   @type simulate_response :: {:ok, SimulateTransactionResponse.t()}
@@ -57,7 +57,7 @@ defmodule Soroban.Contract.RPCCalls do
         _sequence_number,
         _signature,
         _invoke_host_function_op,
-        auth_account \\ nil
+        auth_secret_key \\ nil
       )
 
   def send_transaction(
@@ -66,10 +66,10 @@ defmodule Soroban.Contract.RPCCalls do
         sequence_number,
         signature,
         invoke_host_function_op,
-        auth_account
+        auth_secret_key
       ) do
     invoke_host_function_op =
-      set_invoke_host_function_params(invoke_host_function_op, footprint, auth, auth_account)
+      set_invoke_host_function_params(invoke_host_function_op, footprint, auth, auth_secret_key)
 
     {:ok, envelope_xdr} =
       source_account
@@ -87,7 +87,7 @@ defmodule Soroban.Contract.RPCCalls do
         _sequence_number,
         _signature,
         _invoke_host_function_op,
-        _auth_account
+        _auth_secret_key
       ),
       do: response
 
@@ -127,7 +127,7 @@ defmodule Soroban.Contract.RPCCalls do
           invoke_host_function :: invoke_host_function(),
           footprint :: String.t(),
           auth :: auth(),
-          auth_account :: auth_account()
+          auth_secret_key :: auth_secret_key()
         ) :: invoke_host_function() | {:error, :required_auth}
   defp set_invoke_host_function_params(invoke_host_function_op, footprint, [auth], nil) do
     invoke_host_function_op
@@ -135,14 +135,19 @@ defmodule Soroban.Contract.RPCCalls do
     |> InvokeHostFunction.set_contract_auth(auth)
   end
 
-  defp set_invoke_host_function_params(invoke_host_function_op, footprint, [auth], auth_account) do
-    authorization = ContractAuth.sign_xdr(auth, auth_account)
+  defp set_invoke_host_function_params(
+         invoke_host_function_op,
+         footprint,
+         [auth],
+         auth_secret_key
+       ) do
+    authorization = ContractAuth.sign_xdr(auth, auth_secret_key)
 
     invoke_host_function_op
     |> InvokeHostFunction.set_footprint(footprint)
     |> InvokeHostFunction.set_contract_auth(authorization)
   end
 
-  defp set_invoke_host_function_params(invoke_host_function_op, footprint, nil, _auth_account),
+  defp set_invoke_host_function_params(invoke_host_function_op, footprint, nil, _auth_secret_key),
     do: InvokeHostFunction.set_footprint(invoke_host_function_op, footprint)
 end
diff --git a/mix.exs b/mix.exs
index a1ccf91..ba6c221 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule Soroban.MixProject do
   use Mix.Project
 
-  @version "0.9.0"
+  @version "0.10.0"
   @github_url "https://github.com/kommitters/soroban.ex"
 
   def project do
diff --git a/test/contract/invoke_contract_function_test.exs b/test/contract/invoke_contract_function_test.exs
index 17116a9..fe6cfa5 100644
--- a/test/contract/invoke_contract_function_test.exs
+++ b/test/contract/invoke_contract_function_test.exs
@@ -205,7 +205,7 @@ defmodule Soroban.Contract.InvokeContractFunctionTest do
       source_secret_with_error: "SDXKY6TSBNS7T2UJMHLIH4BWTP4EHR52HZTRNEKH33ML3ARJI2AKIPEC",
       function_name: "function_name",
       function_args: [Symbol.new("Arg")],
-      auth_accounts: ["SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK"],
+      auth_secret_key: "SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK",
       xdr_envelope:
         "AAAAAgAAAADJTnjlYcJxSKDat78jbEyDkVqo2uhpNX4BdBtqGrx+1gAAAGQABPEIAAAAPgAAAAAAAAAAAAAAAQAAAAAAAAAYAAAAAAAAAAMAAAANAAAAIL5BOLMcxdDZ2RtTGT10MW0lRAZ5TsD4HT7UD03BuGpuAAAADwAAAA1mdW5jdGlvbl9uYW1lAAAAAAAADwAAAANBcmcAAAAAAgAAAAbRT4ReAkUa6lMq9OExKvhlyTk7tBFtSkBT/PaIo3WjUgAAABQAAAAHQtAjKFI/GD4AoVvILmUtGNiMgqn+2QuDLQmXBcK8zRoAAAAAAAAAAAAAAAAAAAAA"
     }
@@ -238,7 +238,7 @@ defmodule Soroban.Contract.InvokeContractFunctionTest do
     source_secret_with_auth: source_secret_with_auth,
     function_name: function_name,
     function_args: function_args,
-    auth_accounts: auth_accounts
+    auth_secret_key: auth_secret_key
   } do
     {:ok,
      %SendTransactionResponse{
@@ -253,7 +253,7 @@ defmodule Soroban.Contract.InvokeContractFunctionTest do
         source_secret_with_auth,
         function_name,
         function_args,
-        auth_accounts
+        auth_secret_key
       )
   end
 
diff --git a/test/contract_test.exs b/test/contract_test.exs
index 5081b9e..e334d41 100644
--- a/test/contract_test.exs
+++ b/test/contract_test.exs
@@ -88,7 +88,7 @@ defmodule Soroban.ContractTest do
       # GDDZSR7Y6TIMSBM72WYVGUH6FB6P7MF6Y6DU7MCNAPFRXI5GCWGWWFRS
       function_name: "function_name",
       function_args: [Symbol.new("Arg")],
-      auth_accounts: ["SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK"],
+      auth_secret_key: "SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK",
       asset_code: :ZZZ,
       wasm:
         <<0, 97, 115, 109, 1, 0, 0, 0, 1, 65, 12, 96, 1, 126, 1, 126, 96, 2, 126, 126, 1, 126, 96,
@@ -152,6 +152,30 @@ defmodule Soroban.ContractTest do
       )
   end
 
+  test "invoke/5 with args and auth_secret_key", %{
+    auth_secret_key: auth_secret_key,
+    contract_id: contract_id,
+    source_secret: source_secret,
+    function_name: function_name,
+    function_args: function_args
+  } do
+    {:ok,
+     %SendTransactionResponse{
+       status: "PENDING",
+       hash: "a4721e2a61e9a6b3f54030396e41c3e352101e6cd649b4453e89fb3e827744f4",
+       latest_ledger: "476420",
+       latest_ledger_close_time: "1683150612",
+       error_result_xdr: nil
+     }} =
+      Contract.invoke(
+        contract_id,
+        source_secret,
+        function_name,
+        function_args,
+        auth_secret_key
+      )
+  end
+
   test "install/2", %{
     wasm: wasm,
     source_secret: source_secret