diff --git a/crates/erc20_payment_lib/src/signer.rs b/crates/erc20_payment_lib/src/signer.rs
index ddb21182..6b4c0dde 100644
--- a/crates/erc20_payment_lib/src/signer.rs
+++ b/crates/erc20_payment_lib/src/signer.rs
@@ -1,129 +1,7 @@
-use crate::contracts::DUMMY_RPC_PROVIDER;
-use crate::eth::get_eth_addr_from_secret;
-use erc20_payment_lib_common::err_custom_create;
-use erc20_payment_lib_common::error::PaymentError;
-use futures_util::future::BoxFuture;
-use futures_util::FutureExt;
-use secp256k1::SecretKey;
-use std::fmt::{Debug, Display, Formatter};
-use std::sync::Arc;
-use tokio::time::timeout;
+mod account;
+mod external;
+mod private;
 
-use web3::types::{Address, SignedTransaction, TransactionParameters, H160};
-
-#[derive(Clone)]
-pub struct SignerAccount {
-    pub address: Address,
-    pub signer: Arc<Box<dyn Signer + Send + Sync>>,
-}
-
-impl Debug for SignerAccount {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(f, "SignerAccount {{ address: {:#x} }}", self.address)
-    }
-}
-
-impl Display for SignerAccount {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{:#x}", self.address)
-    }
-}
-
-impl SignerAccount {
-    pub fn new(address: H160, signer: Arc<Box<dyn Signer + Send + Sync>>) -> Self {
-        Self { address, signer }
-    }
-
-    pub async fn check_if_sign_possible(&self) -> Result<(), PaymentError> {
-        match timeout(
-            std::time::Duration::from_secs(5),
-            self.signer.check_if_sign_possible(self.address),
-        )
-        .await
-        {
-            Ok(Ok(())) => Ok(()),
-            Ok(Err(err)) => Err(err_custom_create!("Sign returned error {err:?}")),
-            Err(err) => Err(err_custom_create!("Sign check timed out {err:?}")),
-        }
-    }
-
-    pub async fn sign(&self, tp: TransactionParameters) -> Result<SignedTransaction, PaymentError> {
-        match timeout(
-            std::time::Duration::from_secs(5),
-            self.signer.sign(self.address, tp),
-        )
-        .await
-        {
-            Ok(Ok(signed)) => Ok(signed),
-            Ok(Err(err)) => Err(err_custom_create!("Sign returned error {err:?}")),
-            Err(err) => Err(err_custom_create!("Sign check timed out {err:?}")),
-        }
-    }
-}
-
-#[derive(Debug)]
-pub struct SignerError {
-    pub message: String,
-}
-
-pub trait Signer: Send + Sync {
-    /// Check if signer can sign transaction for given public address
-    fn check_if_sign_possible(&self, pub_address: H160) -> BoxFuture<'_, Result<(), SignerError>>;
-
-    /// Sign transaction for given public address (look at PrivateKeySigner for example)
-    fn sign(
-        &self,
-        pub_address: H160,
-        tp: TransactionParameters,
-    ) -> BoxFuture<'_, Result<SignedTransaction, SignerError>>;
-}
-
-/// PrivateKeySigner is implementation of Signer trait that stores private keys in memory and use
-/// them to sign transactions matching them by public addresses
-pub struct PrivateKeySigner {
-    secret_keys: Vec<SecretKey>,
-}
-
-impl PrivateKeySigner {
-    pub fn new(secret_keys: Vec<SecretKey>) -> Self {
-        Self { secret_keys }
-    }
-
-    fn get_private_key(&self, pub_address: H160) -> Result<&SecretKey, SignerError> {
-        self.secret_keys
-            .iter()
-            .find(|sk| get_eth_addr_from_secret(sk) == pub_address)
-            .ok_or(SignerError {
-                message: "Failed to find private key for address: {from_addr}".to_string(),
-            })
-    }
-}
-
-impl Signer for PrivateKeySigner {
-    fn check_if_sign_possible(&self, pub_address: H160) -> BoxFuture<'_, Result<(), SignerError>> {
-        async move {
-            self.get_private_key(pub_address)?;
-            Ok(())
-        }
-        .boxed()
-    }
-
-    fn sign(
-        &self,
-        pub_address: H160,
-        tp: TransactionParameters,
-    ) -> BoxFuture<'_, Result<SignedTransaction, SignerError>> {
-        async move {
-            let secret_key = self.get_private_key(pub_address)?;
-            let signed = DUMMY_RPC_PROVIDER
-                .accounts()
-                .sign_transaction(tp, secret_key)
-                .await
-                .map_err(|err| SignerError {
-                    message: format!("Error when signing transaction in PrivateKeySigner {err}"),
-                })?;
-            Ok(signed)
-        }
-        .boxed()
-    }
-}
+pub use account::*;
+pub use external::*;
+pub use private::*;
diff --git a/crates/erc20_payment_lib/src/signer/account.rs b/crates/erc20_payment_lib/src/signer/account.rs
new file mode 100644
index 00000000..75494ec2
--- /dev/null
+++ b/crates/erc20_payment_lib/src/signer/account.rs
@@ -0,0 +1,58 @@
+use erc20_payment_lib_common::err_custom_create;
+use erc20_payment_lib_common::error::PaymentError;
+use std::fmt::{Debug, Display, Formatter};
+use std::sync::Arc;
+use tokio::time::timeout;
+
+use super::Signer;
+use web3::types::{Address, SignedTransaction, TransactionParameters, H160};
+
+#[derive(Clone)]
+pub struct SignerAccount {
+    pub address: Address,
+    pub signer: Arc<Box<dyn Signer + Send + Sync>>,
+}
+
+impl Debug for SignerAccount {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "SignerAccount {{ address: {:#x} }}", self.address)
+    }
+}
+
+impl Display for SignerAccount {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{:#x}", self.address)
+    }
+}
+
+impl SignerAccount {
+    pub fn new(address: H160, signer: Arc<Box<dyn Signer + Send + Sync>>) -> Self {
+        Self { address, signer }
+    }
+
+    pub async fn check_if_sign_possible(&self) -> Result<(), PaymentError> {
+        match timeout(
+            std::time::Duration::from_secs(5),
+            self.signer.check_if_sign_possible(self.address),
+        )
+        .await
+        {
+            Ok(Ok(())) => Ok(()),
+            Ok(Err(err)) => Err(err_custom_create!("Sign returned error {err:?}")),
+            Err(err) => Err(err_custom_create!("Sign check timed out {err:?}")),
+        }
+    }
+
+    pub async fn sign(&self, tp: TransactionParameters) -> Result<SignedTransaction, PaymentError> {
+        match timeout(
+            std::time::Duration::from_secs(5),
+            self.signer.sign(self.address, tp),
+        )
+        .await
+        {
+            Ok(Ok(signed)) => Ok(signed),
+            Ok(Err(err)) => Err(err_custom_create!("Sign returned error {err:?}")),
+            Err(err) => Err(err_custom_create!("Sign check timed out {err:?}")),
+        }
+    }
+}
diff --git a/crates/erc20_payment_lib/src/signer/external.rs b/crates/erc20_payment_lib/src/signer/external.rs
new file mode 100644
index 00000000..edd10af9
--- /dev/null
+++ b/crates/erc20_payment_lib/src/signer/external.rs
@@ -0,0 +1,21 @@
+use futures_util::future::BoxFuture;
+use std::fmt::Debug;
+
+use web3::types::{SignedTransaction, TransactionParameters, H160};
+
+#[derive(Debug)]
+pub struct SignerError {
+    pub message: String,
+}
+
+pub trait Signer: Send + Sync {
+    /// Check if signer can sign transaction for given public address
+    fn check_if_sign_possible(&self, pub_address: H160) -> BoxFuture<'_, Result<(), SignerError>>;
+
+    /// Sign transaction for given public address (look at PrivateKeySigner for example)
+    fn sign(
+        &self,
+        pub_address: H160,
+        tp: TransactionParameters,
+    ) -> BoxFuture<'_, Result<SignedTransaction, SignerError>>;
+}
diff --git a/crates/erc20_payment_lib/src/signer/private.rs b/crates/erc20_payment_lib/src/signer/private.rs
new file mode 100644
index 00000000..ebd22bf8
--- /dev/null
+++ b/crates/erc20_payment_lib/src/signer/private.rs
@@ -0,0 +1,58 @@
+use crate::contracts::DUMMY_RPC_PROVIDER;
+use crate::eth::get_eth_addr_from_secret;
+use futures_util::future::BoxFuture;
+use futures_util::FutureExt;
+use secp256k1::SecretKey;
+
+use super::{Signer, SignerError};
+use web3::types::{SignedTransaction, TransactionParameters, H160};
+
+/// PrivateKeySigner is implementation of Signer trait that stores private keys in memory and use
+/// them to sign transactions matching them by public addresses
+pub struct PrivateKeySigner {
+    secret_keys: Vec<SecretKey>,
+}
+
+impl PrivateKeySigner {
+    pub fn new(secret_keys: Vec<SecretKey>) -> Self {
+        Self { secret_keys }
+    }
+
+    fn get_private_key(&self, pub_address: H160) -> Result<&SecretKey, SignerError> {
+        self.secret_keys
+            .iter()
+            .find(|sk| get_eth_addr_from_secret(sk) == pub_address)
+            .ok_or(SignerError {
+                message: "Failed to find private key for address: {from_addr}".to_string(),
+            })
+    }
+}
+
+impl Signer for PrivateKeySigner {
+    fn check_if_sign_possible(&self, pub_address: H160) -> BoxFuture<'_, Result<(), SignerError>> {
+        async move {
+            self.get_private_key(pub_address)?;
+            Ok(())
+        }
+        .boxed()
+    }
+
+    fn sign(
+        &self,
+        pub_address: H160,
+        tp: TransactionParameters,
+    ) -> BoxFuture<'_, Result<SignedTransaction, SignerError>> {
+        async move {
+            let secret_key = self.get_private_key(pub_address)?;
+            let signed = DUMMY_RPC_PROVIDER
+                .accounts()
+                .sign_transaction(tp, secret_key)
+                .await
+                .map_err(|err| SignerError {
+                    message: format!("Error when signing transaction in PrivateKeySigner {err}"),
+                })?;
+            Ok(signed)
+        }
+        .boxed()
+    }
+}