diff --git a/src/lib.rs b/src/lib.rs
index a88ea23..779971d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,9 @@
 #![warn(clippy::all, clippy::pedantic)]
-pub mod fingerprint;
-pub mod host;
+mod fingerprint;
+mod host;
+pub mod prelude;
 pub mod receiver;
-pub mod request;
-pub mod response;
-pub mod sender;
-pub mod status;
+mod request;
+mod response;
+mod sender;
+mod status;
diff --git a/src/prelude.rs b/src/prelude.rs
new file mode 100644
index 0000000..a42fb1e
--- /dev/null
+++ b/src/prelude.rs
@@ -0,0 +1,9 @@
+pub use super::{
+    fingerprint::{Fingerprint, Error as FingerprintError},
+    host::{Host, ParseHostError},
+    receiver,
+    response::{Response, Error as ParseResponseError},
+    request::{Request, ParseRequestError},
+    sender::{CertificateStore, Error as SenderError, Sender, Verifier},
+    status::*,
+};
diff --git a/src/response.rs b/src/response.rs
index 77821f4..a1c377f 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -1,6 +1,8 @@
-use std::{fmt, num::ParseIntError, str::FromStr};
+use std::{fmt, str::FromStr};
+use crate::prelude::Status;
 
-use crate::status::{ParseStatusError, Status};
+mod error;
+pub use error::Error;
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Response {
@@ -14,58 +16,18 @@ impl fmt::Display for Response {
     }
 }
 
-#[derive(Clone, Debug, PartialEq)]
-pub enum ParseResponseError {
-    TooLong,
-    ParseInt(ParseIntError),
-    StatusError,
-    Malformed,
-}
-
-impl fmt::Display for ParseResponseError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::TooLong => write!(f, "ParseResponseError: too long"),
-            Self::ParseInt(e) => write!(f, "ParseResponseError: {e}"),
-            Self::StatusError => write!(f, "ParseResponseError: Invalid Status"),
-            Self::Malformed => write!(f, "ParseResponseError: Malformed"),
-        }
-    }
-}
-
-impl std::error::Error for ParseResponseError {
-    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
-        match self {
-            Self::ParseInt(e) => Some(e),
-            _ => None,
-        }
-    }
-}
-
-impl From<ParseIntError> for ParseResponseError {
-    fn from(value: ParseIntError) -> Self {
-        Self::ParseInt(value)
-    }
-}
-
-impl From<ParseStatusError> for ParseResponseError {
-    fn from(_value: ParseStatusError) -> Self {
-        Self::StatusError
-    }
-}
-
 impl FromStr for Response {
-    type Err = ParseResponseError;
+    type Err = Error;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         if s.len() > 2048 {
-            return Err(ParseResponseError::TooLong);
+            return Err(Error::TooLong);
         }
         if !s.ends_with("\r\n") {
-            return Err(ParseResponseError::Malformed);
+            return Err(Error::Malformed);
         }
         let Some((status, meta)) = s.split_once(' ') else {
-            return Err(ParseResponseError::Malformed);
+            return Err(Error::Malformed);
         };
         let status: u8 = status.parse()?;
         let status: Status = status.try_into()?;
@@ -90,14 +52,14 @@ mod tests {
     #[test]
     fn parse_badend() {
         let response = "20 message delivered\n".parse::<Response>();
-        assert_eq!(response, Err(ParseResponseError::Malformed));
+        assert_eq!(response, Err(Error::Malformed));
     }
 
     #[test]
     fn parse_badint() {
         let response = "twenty message deliverred\r\n".parse::<Response>();
         match response {
-            Err(ParseResponseError::ParseInt(_)) => {}
+            Err(Error::ParseInt(_)) => {}
             _ => panic!(),
         }
     }
diff --git a/src/response/error.rs b/src/response/error.rs
new file mode 100644
index 0000000..7783943
--- /dev/null
+++ b/src/response/error.rs
@@ -0,0 +1,45 @@
+use {
+    crate::prelude::ParseStatusError,
+    std::{fmt, num::ParseIntError},
+};
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum Error {
+    TooLong,
+    ParseInt(ParseIntError),
+    StatusError,
+    Malformed,
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::TooLong => write!(f, "ParseResponseError: too long"),
+            Self::ParseInt(e) => write!(f, "ParseResponseError: {e}"),
+            Self::StatusError => write!(f, "ParseResponseError: Invalid Status"),
+            Self::Malformed => write!(f, "ParseResponseError: Malformed"),
+        }
+    }
+}
+
+impl std::error::Error for Error {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Self::ParseInt(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+impl From<ParseIntError> for Error {
+    fn from(value: ParseIntError) -> Self {
+        Self::ParseInt(value)
+    }
+}
+
+impl From<ParseStatusError> for Error {
+    fn from(_value: ParseStatusError) -> Self {
+        Self::StatusError
+    }
+}
+
diff --git a/src/sender.rs b/src/sender.rs
index 520e35f..979c175 100644
--- a/src/sender.rs
+++ b/src/sender.rs
@@ -1,84 +1,32 @@
-use self::{store::CertificateStore, verifier::Verifier};
 use crate::{
-    request::{ParseRequestError, Request},
-    response::{ParseResponseError, Response},
-};
-use std::{
-    fmt,
-    io::{self, Read, Write},
+    request::Request,
+    response::Response,
 };
+use std::io::{Read, Write};
+pub use self::{error::Error, verifier::{CertificateStore, Verifier}};
 
-pub mod store;
-pub mod verifier;
+mod error;
+mod verifier;
 
 #[derive(Debug)]
-pub struct Sender<'a, S: CertificateStore, C: Sized, T: Read + Write + Sized> {
-    pub request: Request,
-    pub verifier: Verifier<'a, S>,
-    pub stream: rustls::StreamOwned<C, T>,
-}
-
-#[derive(Debug)]
-pub enum Error {
-    TlsError(rustls::Error),
-    RequestError(ParseRequestError),
-    ResponseError(ParseResponseError),
-    IoError(io::Error),
-}
-
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::TlsError(e) => write!(f, "{e}"),
-            Self::RequestError(e) => write!(f, "{e}"),
-            Self::ResponseError(e) => write!(f, "{e}"),
-            Self::IoError(e) => write!(f, "{e}"),
-        }
-    }
-}
-
-impl std::error::Error for Error {
-    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
-        match self {
-            Self::RequestError(e) => Some(e),
-            Self::ResponseError(e) => Some(e),
-            Self::TlsError(e) => Some(e),
-            Self::IoError(e) => Some(e),
-        }
-    }
-}
-
-impl From<rustls::Error> for Error {
-    fn from(value: rustls::Error) -> Self {
-        Self::TlsError(value)
-    }
-}
-
-impl From<ParseRequestError> for Error {
-    fn from(value: ParseRequestError) -> Self {
-        Self::RequestError(value)
-    }
-}
-
-impl From<ParseResponseError> for Error {
-    fn from(value: ParseResponseError) -> Self {
-        Self::ResponseError(value)
-    }
-}
-
-impl From<io::Error> for Error {
-    fn from(value: io::Error) -> Self {
-        Self::IoError(value)
-    }
-}
-
-impl<'a, S, C, T> Sender<'a, S, C, T>
+pub struct Sender<S, C, T>
 where
-    S: CertificateStore + Sync,
+    S: CertificateStore,
     C: Sized,
     T: Read + Write + Sized,
 {
-    pub fn new(request_str: &str, store: &'a S) -> Result<Self, Error> {
+    pub request: Request,
+    pub verifier: Verifier<S>,
+    pub stream: rustls::StreamOwned<C, T>,
+}
+
+impl<S, C, T> Sender<S, C, T>
+where
+    S: CertificateStore,
+    C: Sized,
+    T: Read + Write + Sized,
+{
+    pub fn new(request_str: &str, store: S) -> Result<Self, Error> {
         let request: Request = request_str.parse()?;
         let verifier = Verifier::new(store);
         unimplemented!();
diff --git a/src/sender/error.rs b/src/sender/error.rs
new file mode 100644
index 0000000..ae7e573
--- /dev/null
+++ b/src/sender/error.rs
@@ -0,0 +1,59 @@
+use {
+    crate::prelude::{ParseRequestError, ParseResponseError},
+    std::{fmt, io},
+};
+
+#[derive(Debug)]
+pub enum Error {
+    TlsError(rustls::Error),
+    RequestError(ParseRequestError),
+    ResponseError(ParseResponseError),
+    IoError(io::Error),
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::TlsError(e) => write!(f, "{e}"),
+            Self::RequestError(e) => write!(f, "{e}"),
+            Self::ResponseError(e) => write!(f, "{e}"),
+            Self::IoError(e) => write!(f, "{e}"),
+        }
+    }
+}
+
+impl std::error::Error for Error {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Self::RequestError(e) => Some(e),
+            Self::ResponseError(e) => Some(e),
+            Self::TlsError(e) => Some(e),
+            Self::IoError(e) => Some(e),
+        }
+    }
+}
+
+impl From<rustls::Error> for Error {
+    fn from(value: rustls::Error) -> Self {
+        Self::TlsError(value)
+    }
+}
+
+impl From<ParseRequestError> for Error {
+    fn from(value: ParseRequestError) -> Self {
+        Self::RequestError(value)
+    }
+}
+
+impl From<ParseResponseError> for Error {
+    fn from(value: ParseResponseError) -> Self {
+        Self::ResponseError(value)
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(value: io::Error) -> Self {
+        Self::IoError(value)
+    }
+}
+
diff --git a/src/sender/store.rs b/src/sender/store.rs
deleted file mode 100644
index 03cf53c..0000000
--- a/src/sender/store.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub trait CertificateStore {
-    fn get(&self, host: &str) -> Option<String>;
-    fn insert(&mut self, host: &str, fingerprint: &str);
-}
diff --git a/src/sender/verifier.rs b/src/sender/verifier.rs
index 7506505..29e1a08 100644
--- a/src/sender/verifier.rs
+++ b/src/sender/verifier.rs
@@ -1,16 +1,21 @@
-use super::store::CertificateStore;
 use crate::fingerprint::Fingerprint;
 use rustls::{
     client::{ServerCertVerified, ServerCertVerifier},
     Certificate,
 };
+use std::sync::{Arc, Mutex};
 
-#[derive(Debug)]
-pub struct Verifier<'a, T: CertificateStore> {
-    store: &'a T,
+pub trait CertificateStore: Send + Sync {
+    fn get(&self, host: &str) -> Option<String>;
+    fn insert(&mut self, host: &str, fingerprint: &str);
 }
 
-impl<'a, T: CertificateStore + Sync> ServerCertVerifier for Verifier<'a, T> {
+#[derive(Debug)]
+pub struct Verifier<S: CertificateStore> {
+    store: Arc<Mutex<S>>,
+}
+
+impl<S: CertificateStore> ServerCertVerifier for Verifier<S> {
     fn verify_server_cert(
         &self,
         end_entity: &Certificate,
@@ -29,8 +34,8 @@ impl<'a, T: CertificateStore + Sync> ServerCertVerifier for Verifier<'a, T> {
             _ => todo!(),
         };
         if let Some(fingerprint) = match server_name {
-            rustls::ServerName::DnsName(n) => self.store.get(n.as_ref()),
-            rustls::ServerName::IpAddress(ip) => self.store.get(&ip.to_string()),
+            rustls::ServerName::DnsName(n) => self.store.lock().unwrap().get(n.as_ref()),
+            rustls::ServerName::IpAddress(ip) => self.store.lock().unwrap().get(&ip.to_string()),
             _ => todo!(),
         } {
             if fingerprint == fp.1 && name == fp.0 {
@@ -38,16 +43,19 @@ impl<'a, T: CertificateStore + Sync> ServerCertVerifier for Verifier<'a, T> {
             }
         } else {
             // todo: need a way to update `self.store`. Probably will require
-            // an Arc<Mutex<T>> for interior mutability
+            // an Arc<Mutex<T>> for interior mutability.
+            // UPDATE: Now wrapped in Arc<Mutex<T>>
         }
-        return Err(rustls::Error::General(
+        Err(rustls::Error::General(
             "Unrecognized certificate".to_string(),
-        ));
+        ))
     }
 }
 
-impl<'a, T: CertificateStore + Sync> Verifier<'a, T> {
-    pub fn new(store: &'a T) -> Self {
-        Self { store }
+impl<T: CertificateStore> Verifier<T> {
+    pub fn new(store: T) -> Self {
+        Self {
+            store: Arc::new(Mutex::new(store)),
+        }
     }
 }