diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..166dfc9
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,290 @@
+use anyhow::Result;
+use isahc::prelude::*;
+use openssl::hash::MessageDigest;
+use openssl::pkey::PKey;
+use openssl::rsa::Rsa;
+use openssl::sign::Signer;
+use serde::{de::DeserializeOwned, Deserialize, Serialize};
+
+const BASE: &str = "https://api.bunq.com";
+
+#[derive(Serialize)]
+struct Installation<'a> {
+    client_public_key: &'a str,
+}
+
+#[derive(Deserialize)]
+struct Token {
+    token: String,
+}
+#[derive(Deserialize)]
+#[serde(rename_all = "PascalCase")]
+struct InstallationResponse {
+    token: Token,
+}
+
+#[derive(Serialize)]
+struct DeviceServer<'a> {
+    description: &'a str,
+    secret: &'a str,
+    permitted_ips: &'a [&'a str],
+}
+
+#[derive(Serialize)]
+struct SessionServer<'a> {
+    secret: &'a str,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "PascalCase")]
+struct SessionServerResponse {
+    token: Token,
+    user_person: UserPerson,
+}
+
+#[derive(Deserialize)]
+struct UserPerson {
+    id: i64,
+}
+
+fn sign<K: openssl::pkey::HasPrivate>(body: &str, key: &PKey<K>) -> Result<String> {
+    let mut signer = Signer::new(MessageDigest::sha256(), key)?;
+
+    let sig = signer.sign_oneshot_to_vec(body.as_bytes())?;
+
+    Ok(base64::encode(&sig))
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "PascalCase")]
+struct RawResponse {
+    response: Vec<serde_json::Value>,
+    pagination: Option<Pagination>,
+}
+
+struct Response<T> {
+    response: T,
+    pagination: Option<Pagination>,
+}
+
+impl RawResponse {
+    fn decode_retarded<T: DeserializeOwned>(self) -> Result<Response<T>> {
+        let mut map = serde_json::Map::new();
+        for e in self.response {
+            if let serde_json::Value::Object(e) = e {
+                let (k, v) = e
+                    .into_iter()
+                    .next()
+                    .ok_or_else(|| anyhow::anyhow!("malformed response"))?;
+                map.insert(k, v);
+            }
+        }
+        Ok(Response {
+            response: serde_json::from_value(map.into())?,
+            pagination: self.pagination,
+        })
+    }
+}
+
+fn deserialize_retarded_response<T: DeserializeOwned>(r: &str) -> Result<Response<T>> {
+    let r: RawResponse = serde_json::from_str(r)?;
+    r.decode_retarded()
+}
+
+fn deserialize_normal_response<T: DeserializeOwned>(r: &str) -> Result<Response<T>> {
+    let r: RawResponse = serde_json::from_str(r)?;
+    Ok(Response {
+        response: serde_json::from_value(r.response.into())?,
+        pagination: r.pagination,
+    })
+}
+
+#[derive(Serialize, Deserialize, Default)]
+struct AppState {
+    token: String,
+    pem_private: String,
+}
+#[derive(Serialize, Deserialize, Default)]
+pub struct BunqConfig {
+    api_key: String,
+    state: Option<AppState>,
+}
+pub struct BunqConfigReady {
+    token: String,
+    keypair: PKey<openssl::pkey::Private>,
+    user_id: i64,
+}
+impl BunqConfig {
+    pub fn load() -> Result<BunqConfig> {
+        Ok(confy::load("bunq-rs")?)
+    }
+    pub fn save(&self) -> Result<()> {
+        confy::store("bunq-rs", self)?;
+        Ok(())
+    }
+    pub fn install(mut self) -> Result<BunqConfigReady> {
+        let api_key = &self.api_key;
+
+        let keypair = if let Some(state) = &self.state {
+            PKey::private_key_from_pem(state.pem_private.as_bytes())?
+        } else {
+            let rsa = Rsa::generate(2048)?;
+            let pem_private = rsa.private_key_to_pem()?;
+            let pem_private = String::from_utf8(pem_private)?;
+
+            let keypair = PKey::from_rsa(rsa)?;
+
+            let pem_public = String::from_utf8(keypair.public_key_to_pem()?)?;
+
+            let body = Installation {
+                client_public_key: &pem_public,
+            };
+            let response = isahc::post(
+                format!("{}/v1/installation", BASE),
+                serde_json::to_string(&body)?,
+            )?
+            .text()?;
+            let response: InstallationResponse = deserialize_retarded_response(&response)?.response;
+            let token = response.token.token;
+
+            let body = DeviceServer {
+                description: "awesome",
+                secret: &api_key,
+                permitted_ips: &["31.21.118.143", "*"],
+            };
+            let body = serde_json::to_string(&body)?;
+            let mut response = isahc::http::Request::post(format!("{}/v1/device-server", BASE))
+                .header("X-Bunq-Client-Authentication", &token)
+                .body(body)?
+                .send()?;
+            println!("{}", response.text()?);
+
+            self.state = Some(AppState { pem_private, token });
+            self.save()?;
+
+            keypair
+        };
+        let token = self.state.unwrap().token;
+        let body = SessionServer { secret: &api_key };
+        let body = serde_json::to_string(&body)?;
+        let sig = sign(&body, &keypair)?;
+        let response = isahc::http::Request::post(format!("{}/v1/session-server", BASE))
+            .header("X-Bunq-Client-Authentication", &token)
+            .header("X-Bunq-Client-Signature", &sig)
+            .body(body)?
+            .send()?
+            .text()?;
+        let r: SessionServerResponse = deserialize_retarded_response(&response)?.response;
+        Ok(BunqConfigReady {
+            keypair,
+            token: r.token.token,
+            user_id: r.user_person.id,
+        })
+    }
+}
+
+impl BunqConfigReady {
+    pub fn monetary_accounts(&self) -> Result<Vec<MonetaryAccountBank>> {
+        let response = isahc::http::Request::get(format!(
+            "{}/v1/user/{}/monetary-account",
+            BASE, self.user_id
+        ))
+        .header("X-Bunq-Client-Authentication", &self.token)
+        .body(())?
+        .send()?
+        .text()?;
+        Ok(
+            deserialize_normal_response::<Vec<MonetaryAccount>>(&response)?
+                .response
+                .into_iter()
+                .map(|m| m.monetary_account_bank)
+                .collect(),
+        )
+    }
+    pub fn payments(&self, acc: &MonetaryAccountBank) -> Result<Vec<Payment>> {
+        let next_page = |url: &str| -> Result<(_, _)> {
+            let response = isahc::http::Request::get(url)
+                .header("X-Bunq-Client-Authentication", &self.token)
+                .body(())?
+                .send()?
+                .text()?;
+            let Response {
+                response,
+                pagination,
+            } = deserialize_normal_response::<Vec<PaymentPayment>>(&response)?;
+            Ok((
+                response.into_iter().map(|p| p.payment).collect(),
+                pagination,
+            ))
+        };
+        let mut url = format!(
+            "/v1/user/{}/monetary-account/{}/payment",
+            self.user_id, acc.id
+        );
+        let mut all = Vec::new();
+        loop {
+            let (mut payments, pag) = next_page(&format!("{}{}", BASE, url))?;
+            all.append(&mut payments);
+            if let Some(Pagination{older_url: Some(older_url),..}) = pag {
+                url = older_url;
+            } else {
+                break;
+            }
+        }
+        Ok(all)
+    }
+}
+
+#[derive(Deserialize, Debug)]
+pub struct LabelMonetaryAccount {
+    pub iban: Option<String>,
+    pub display_name: String,
+    pub merchant_category_code: Option<String>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct Amount {
+    pub value: String,
+    pub currency: String,
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "PascalCase")]
+struct PaymentPayment {
+    payment: Payment,
+}
+
+#[derive(Deserialize, Debug)]
+struct Pagination {
+    future_url: Option<String>,
+    newer_url: Option<String>,
+    older_url: Option<String>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct Payment {
+    pub alias: LabelMonetaryAccount,
+    pub counterparty_alias: LabelMonetaryAccount,
+    pub amount: Amount,
+    pub balance_after_mutation: Amount,
+    pub created: String,
+    pub updated: String,
+    pub description: String,
+    pub id: i64,
+    pub monetary_account_id: i64,
+    #[serde(rename = "type")]
+    pub type_: String,
+    pub sub_type: String,
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "PascalCase")]
+struct MonetaryAccount {
+    monetary_account_bank: MonetaryAccountBank,
+}
+#[derive(Deserialize, Debug)]
+pub struct MonetaryAccountBank {
+    pub id: i64,
+    pub description: String,
+}
+
diff --git a/src/main.rs b/src/main.rs
index 2009364..34fa874 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,297 +1,8 @@
 use anyhow::Result;
-use isahc::prelude::*;
-use openssl::hash::MessageDigest;
-use openssl::pkey::PKey;
-use openssl::rsa::Rsa;
-use openssl::sign::{Signer, Verifier};
-use serde::{de::DeserializeOwned, Deserialize, Serialize};
-
-const BASE: &str = "https://api.bunq.com";
-
-#[derive(Serialize)]
-struct Installation<'a> {
-    client_public_key: &'a str,
-}
-
-#[derive(Deserialize)]
-struct Token {
-    token: String,
-}
-#[derive(Deserialize)]
-#[serde(rename_all = "PascalCase")]
-struct InstallationResponse {
-    token: Token,
-}
-
-#[derive(Serialize)]
-struct DeviceServer<'a> {
-    description: &'a str,
-    secret: &'a str,
-    permitted_ips: &'a [&'a str],
-}
-
-#[derive(Serialize)]
-struct SessionServer<'a> {
-    secret: &'a str,
-}
-
-#[derive(Deserialize)]
-#[serde(rename_all = "PascalCase")]
-struct SessionServerResponse {
-    token: Token,
-    user_person: UserPerson,
-}
-
-#[derive(Deserialize)]
-struct UserPerson {
-    id: i64,
-}
-
-fn sign<K: openssl::pkey::HasPrivate>(body: &str, key: &PKey<K>) -> Result<String> {
-    let mut signer = Signer::new(MessageDigest::sha256(), key)?;
-
-    let sig = signer.sign_oneshot_to_vec(body.as_bytes())?;
-
-    Ok(base64::encode(&sig))
-}
-
-#[derive(Deserialize)]
-#[serde(rename_all = "PascalCase")]
-struct RawResponse {
-    response: Vec<serde_json::Value>,
-    pagination: Option<Pagination>,
-}
-
-struct Response<T> {
-    response: T,
-    pagination: Option<Pagination>,
-}
-
-impl RawResponse {
-    fn decode_retarded<T: DeserializeOwned>(self) -> Result<Response<T>> {
-        let mut map = serde_json::Map::new();
-        for e in self.response {
-            if let serde_json::Value::Object(e) = e {
-                let (k, v) = e
-                    .into_iter()
-                    .next()
-                    .ok_or_else(|| anyhow::anyhow!("malformed response"))?;
-                map.insert(k, v);
-            }
-        }
-        Ok(Response {
-            response: serde_json::from_value(map.into())?,
-            pagination: self.pagination,
-        })
-    }
-}
-
-fn deserialize_retarded_response<T: DeserializeOwned>(r: &str) -> Result<Response<T>> {
-    let r: RawResponse = serde_json::from_str(r)?;
-    r.decode_retarded()
-}
-
-fn deserialize_normal_response<T: DeserializeOwned>(r: &str) -> Result<Response<T>> {
-    let r: RawResponse = serde_json::from_str(r)?;
-    Ok(Response {
-        response: serde_json::from_value(r.response.into())?,
-        pagination: r.pagination,
-    })
-}
-
-#[derive(Serialize, Deserialize, Default)]
-struct AppState {
-    token: String,
-    pem_private: String,
-}
-#[derive(Serialize, Deserialize, Default)]
-struct AppConfig {
-    api_key: String,
-    state: Option<AppState>,
-}
-struct AppConfigReady {
-    api_key: String,
-    token: String,
-    keypair: PKey<openssl::pkey::Private>,
-    user_id: i64,
-}
-impl AppConfig {
-    pub fn load() -> Result<AppConfig> {
-        Ok(confy::load("bunqledger")?)
-    }
-    pub fn save(&self) -> Result<()> {
-        confy::store("bunqledger", self)?;
-        Ok(())
-    }
-    pub fn install(mut self) -> Result<AppConfigReady> {
-        let api_key = &self.api_key;
-
-        let keypair = if let Some(state) = &self.state {
-            PKey::private_key_from_pem(state.pem_private.as_bytes())?
-        } else {
-            let rsa = Rsa::generate(2048)?;
-            let pem_private = rsa.private_key_to_pem()?;
-            let pem_private = String::from_utf8(pem_private)?;
-
-            let keypair = PKey::from_rsa(rsa)?;
-
-            let pem_public = String::from_utf8(keypair.public_key_to_pem()?)?;
-
-            let body = Installation {
-                client_public_key: &pem_public,
-            };
-            let response = isahc::post(
-                format!("{}/v1/installation", BASE),
-                serde_json::to_string(&body)?,
-            )?
-            .text()?;
-            let response: InstallationResponse = deserialize_retarded_response(&response)?.response;
-            let token = response.token.token;
-
-            let body = DeviceServer {
-                description: "awesome",
-                secret: &api_key,
-                permitted_ips: &["31.21.118.143", "*"],
-            };
-            let body = serde_json::to_string(&body)?;
-            let mut response = isahc::http::Request::post(format!("{}/v1/device-server", BASE))
-                .header("X-Bunq-Client-Authentication", &token)
-                .body(body)?
-                .send()?;
-            println!("{}", response.text()?);
-
-            self.state = Some(AppState { pem_private, token });
-            self.save()?;
-
-            keypair
-        };
-        let token = self.state.unwrap().token;
-        let body = SessionServer { secret: &api_key };
-        let body = serde_json::to_string(&body)?;
-        let sig = sign(&body, &keypair)?;
-        let response = isahc::http::Request::post(format!("{}/v1/session-server", BASE))
-            .header("X-Bunq-Client-Authentication", &token)
-            .header("X-Bunq-Client-Signature", &sig)
-            .body(body)?
-            .send()?
-            .text()?;
-        let r: SessionServerResponse = deserialize_retarded_response(&response)?.response;
-        Ok(AppConfigReady {
-            api_key: self.api_key,
-            keypair,
-            token: r.token.token,
-            user_id: r.user_person.id,
-        })
-    }
-}
-
-impl AppConfigReady {
-    pub fn monetary_accounts(&self) -> Result<Vec<MonetaryAccountBank>> {
-        let response = isahc::http::Request::get(format!(
-            "{}/v1/user/{}/monetary-account",
-            BASE, self.user_id
-        ))
-        .header("X-Bunq-Client-Authentication", &self.token)
-        .body(())?
-        .send()?
-        .text()?;
-        Ok(
-            deserialize_normal_response::<Vec<MonetaryAccount>>(&response)?
-                .response
-                .into_iter()
-                .map(|m| m.monetary_account_bank)
-                .collect(),
-        )
-    }
-    pub fn payments(&self, acc: &MonetaryAccountBank) -> Result<Vec<Payment>> {
-        let next_page = |url: &str| -> Result<(_, _)> {
-            let response = isahc::http::Request::get(url)
-                .header("X-Bunq-Client-Authentication", &self.token)
-                .body(())?
-                .send()?
-                .text()?;
-            let Response {
-                response,
-                pagination,
-            } = deserialize_normal_response::<Vec<PaymentPayment>>(&response)?;
-            Ok((
-                response.into_iter().map(|p| p.payment).collect(),
-                pagination,
-            ))
-        };
-        let mut url = format!(
-            "/v1/user/{}/monetary-account/{}/payment",
-            self.user_id, acc.id
-        );
-        let mut all = Vec::new();
-        loop {
-            let (mut payments, pag) = next_page(&format!("{}{}", BASE, url))?;
-            all.append(&mut payments);
-            if let Some(Pagination{older_url: Some(older_url),..}) = pag {
-                url = older_url;
-            } else {
-                break;
-            }
-        }
-        Ok(all)
-    }
-}
-
-#[derive(Deserialize, Debug)]
-struct LabelMonetaryAccount {
-    iban: Option<String>,
-    display_name: String,
-    merchant_category_code: Option<String>,
-}
-
-#[derive(Deserialize, Debug)]
-struct Amount {
-    value: String,
-    currency: String,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct PaymentPayment {
-    payment: Payment,
-}
-
-#[derive(Deserialize, Debug)]
-struct Pagination {
-    future_url: Option<String>,
-    newer_url: Option<String>,
-    older_url: Option<String>,
-}
-
-#[derive(Deserialize, Debug)]
-struct Payment {
-    alias: LabelMonetaryAccount,
-    counterparty_alias: LabelMonetaryAccount,
-    amount: Amount,
-    balance_after_mutation: Amount,
-    created: String,
-    updated: String,
-    description: String,
-    id: i64,
-    monetary_account_id: i64,
-    #[serde(rename = "type")]
-    type_: String,
-    sub_type: String,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct MonetaryAccount {
-    monetary_account_bank: MonetaryAccountBank,
-}
-#[derive(Deserialize, Debug)]
-struct MonetaryAccountBank {
-    id: i64,
-    description: String,
-}
+use bunqledger::BunqConfig;
 
 fn main() -> Result<()> {
-    let cfg = AppConfig::load()?;
+    let cfg = BunqConfig::load()?;
 
     let cfg = cfg.install()?;
     let accs = cfg.monetary_accounts()?;