diff --git a/resources/application.ts b/resources/application.ts
index 0b3552ae..1ca704c2 100644
--- a/resources/application.ts
+++ b/resources/application.ts
@@ -1,21 +1,15 @@
 import axios, { AxiosResponse } from 'axios'
 import { Application, ApplicationDocument, CreateApplicationRequest } from '../types/application';
 import { UnitResponse, Include, UnitError } from '../types/core';
+import { BaseResource } from './baseResource';
 
-export class Applications {
-    private token: string;
-    private basePath = 'https://api.s.unit.sh';
-    private resourcePath = '/applications'
+export class Applications extends BaseResource{
 
-    constructor(token: string) {
-        this.token = token
+    constructor(token: string, basePath: string) {
+        super(token, basePath + '/applications');
     }
 
     public async list(params: ApplicationListParams): Promise<UnitResponse<Application[]> | UnitError> {
-        var headers = {
-            'Authorization': `Bearer ${this.token}`
-        };
-
         var parameters = {
             'page[limit]': (params.limit ? params.limit : 100),
             'page[offset]': (params.offset ? params.offset : 0),
@@ -24,39 +18,24 @@ export class Applications {
             ...(params.tags && { 'filter[tags]': params.tags }),
             'sort': params.sort ? params.sort : '-createdAt'
         }
-        var res = await axios.get<AxiosResponse<Application[] | UnitError>>(`${this.basePath + this.resourcePath}`, { headers: headers, params: parameters })
-            .then(r => r.data)
-            .catch(error => { return error.response.data })
-
-        return res
 
+        return this.httpGet<UnitResponse<Application[]>>('', { params: parameters })
     }
 
     public async create(request: CreateApplicationRequest): Promise<UnitResponse<Application> | UnitError> {
         var headers = {
-            'Authorization': `Bearer ${this.token}`,
             'Content-Type': 'application/vnd.api+json'
         };
 
-        var res = await axios.post<UnitResponse<Application> | UnitError>(`${this.basePath + this.resourcePath}`, { data: request }, { headers })
-            .then(r => r.data)
-            .catch(error => { return error.response.data })
-
-        return res
+        return this.httpPost<UnitResponse<Application>>('', { data: request }, { headers })
     }
 
-    public async get(id: number): Promise<UnitResponse<Application> & Include<ApplicationDocument[]> | UnitError> {
-        var headers = {
-            'Authorization': `Bearer ${this.token}`
-        };
-
-        var path = `${this.basePath + this.resourcePath}/${id}`
-
-        var res = await axios.get<UnitResponse<Application> & Include<ApplicationDocument[]> | UnitError>(path, { headers })
-            .then(r => r.data)
-            .catch(error => { return error.response.data })
+    public async get(applicationId: number): Promise<UnitResponse<Application> & Include<ApplicationDocument[]> | UnitError> {
+        return this.httpGet<UnitResponse<Application> & Include<ApplicationDocument[]>>(`/${applicationId}`)
+    }
 
-        return res
+    public async listDocuments(applicationId: number): Promise<UnitResponse<ApplicationDocument[]> | UnitError> {
+        return this.httpGet<UnitResponse<ApplicationDocument[]>>(`/${applicationId}/documents`)
     }
 }
 
@@ -96,4 +75,4 @@ interface ApplicationListParams {
      * default: sort=-createdAt	
      */
     sort?: string
-}
\ No newline at end of file
+}
diff --git a/resources/baseResource.ts b/resources/baseResource.ts
new file mode 100644
index 00000000..e3a2e814
--- /dev/null
+++ b/resources/baseResource.ts
@@ -0,0 +1,56 @@
+import axios from "axios"
+import { UnitError } from "../types/core"
+
+export class BaseResource {
+    private resourcePath: string
+    private headers: {};
+
+    constructor(token: string, resourcePath: string) {
+        this.resourcePath = resourcePath
+
+        this.headers = {
+            'Authorization': `Bearer ${token}`,
+            'Content-Type': 'application/vnd.api+json'
+        };
+    }
+
+    protected async httpGet<T>(path: string, config?: { headers?: object, params?: object }) : Promise<UnitError | T> {
+
+        var conf = {
+            headers: config?.headers ? { ...this.headers, ...config?.headers } : this.headers,
+            ...(config?.params && { params: (config.params)})
+        }
+
+        return await axios.get<T | UnitError>(this.resourcePath + path, conf)
+            .then(r => r.data)
+            .catch(error => { return error.response.data })
+    }
+
+    protected async httpPatch<T>(path: string, data: object, config?: { headers?: object, params?: object }) : Promise<UnitError | T> {
+        var conf = {
+            headers: config?.headers ? { ...this.headers, ...config?.headers } : this.headers,
+            ...(config?.params && { params: (config.params) })
+        }
+
+        return await axios.patch<T | UnitError>(this.resourcePath + path, data, conf)
+            .then(r => r.data)
+            .catch(error => { return error.response.data })
+    }
+
+    protected async httpPost<T>(path: string, data: object, config?: { headers?: object, params?: object }) : Promise<UnitError | T>{
+        var conf = {
+            headers: config?.headers ? { ...this.headers, ...config?.headers } : this.headers,
+            ...(config?.params && { params: (config.params) })
+        }
+
+        return await axios.post<T | UnitError>(this.resourcePath + path, data, conf)
+            .then(r => r.data)
+            .catch(error => { return error.response.data })
+    }
+
+    protected async httpDelete<T>(path: string) : Promise<UnitError | T> {
+        return await axios.delete<T | UnitError>(this.resourcePath + path)
+            .then(r => r.data)
+            .catch(error => { return error.response.data })
+    }
+}
\ No newline at end of file
diff --git a/resources/customer.ts b/resources/customer.ts
new file mode 100644
index 00000000..61085a2f
--- /dev/null
+++ b/resources/customer.ts
@@ -0,0 +1,75 @@
+import { UnitResponse, UnitError} from "../types/core";
+import { Customer, PatchBusinessCustomerRequest, PatchIndividualCustomerRequest } from "../types/customer";
+import { BaseResource } from "./baseResource";
+
+export class Customers extends BaseResource {
+
+    constructor(token: string, basePath: string) {
+        super(token, basePath + '/customers')
+    }
+
+    public async updateIndividual(request: PatchIndividualCustomerRequest) {
+        return this.httpPatch<UnitResponse<Customer>>(`/${request.customerId}`, { data: request.data })
+    }
+
+    public async updateBusiness(request: PatchBusinessCustomerRequest) {
+        return this.httpPatch<UnitResponse<Customer>>(`/${request.customerId}`, { data: request.data })
+    }
+
+    public async get(customerId: number): Promise<UnitResponse<Customer> | UnitError> {
+
+        return this.httpGet<UnitResponse<Customer>>(`/${customerId}`)
+    }
+
+    public async list(params?: CustomersListParams): Promise<UnitResponse<Customer[]> | UnitError> {
+
+        var parameters = {
+            'page[limit]': (params?.limit ? params.limit : 100),
+            'page[offset]': (params?.offset ? params.offset : 0),
+            ...(params?.query && { 'filter[query]': params.query }),
+            ...(params?.email && { 'filter[email]': params.email }),
+            ...(params?.tags && { 'filter[tags]': params.tags }),
+            'sort': params?.sort ? params.sort : '-createdAt'
+        }
+
+        return this.httpGet<UnitResponse<Customer[]>>('', { params: parameters })
+    }
+}
+
+interface CustomersListParams {
+    /**
+     * Maximum number of resources that will be returned. Maximum is 1000 resources. See Pagination.
+     * default: 100
+     */
+    limit?: number,
+
+    /**
+     * Number of resources to skip. See Pagination.
+     * default: 0
+     */
+    offset?: number,
+
+    /**
+     * Optional. Search term according to the Full-Text Search Rules.
+     * default: empty
+     */
+    query?: string,
+
+    /**
+     * Optional. Filter customers by email address (case sensitive).
+     * default: empty
+     */
+    email?: string,
+
+    /**
+     * Optional. Filter customers by Tags.
+     * default: empty
+     */
+    tags?: Object,
+
+    /**
+     * Optional. sort=createdAt for ascending order or sort=-createdAt (leading minus sign) for descending order.
+     * default: sort=-createdAt	
+     */
+    sort?: string
+}
diff --git a/resources/unit.ts b/resources/unit.ts
index 6c3571bd..abcfeb2f 100644
--- a/resources/unit.ts
+++ b/resources/unit.ts
@@ -1,12 +1,13 @@
 import { Applications } from './application'
+import { Customers } from './customer';
 
 export class Unit {
-    private token: string;
     public applications: Applications
+    public customers: Customers
 
-    constructor(token: string) {
-        this.token = token;
-        this.applications = new Applications(token);
+    constructor(token: string, basePath: string) {
+        this.applications = new Applications(token, basePath);
+        this.customers = new Customers(token, basePath)
     }
 }
 
diff --git a/types/application.ts b/types/application.ts
index 87394605..db8b565b 100644
--- a/types/application.ts
+++ b/types/application.ts
@@ -1,4 +1,4 @@
-import { Address, BeneficialOwner, BusinessContact, FullName, Officer, Phone, State } from "./core"
+import { Address, BeneficialOwner, BusinessContact, FullName, Officer, Phone, State, Relationship } from "./core"
 
 export type ApplicationStatus =
     "AwaitingDocuments" | //Certain documents are required for the process to continue. You may upload them via Upload Document.
@@ -7,11 +7,6 @@ export type ApplicationStatus =
     "Approved" |          //The application was approved. A Customer resource was created.
     "Denied"              //The application was denied. A Customer resource will not be created.
 
-/**
- * More about [Relationship](https://developers.unit.co/#relationships)
- */
-export type Relationship = null | [] | { type: string, id: string } | Array<{ type: string, id: string }>
-
 export interface Application {
     /**
      * Identifier of the application resource.
@@ -21,7 +16,7 @@ export interface Application {
     /**
      * Type of the application resource.
      */
-    type: string
+    type: 'IndividualApplication' | 'BusinessApplication'
 
     /**
      * The relationships object describes the relationship between the current resource and other resources.
@@ -131,6 +126,7 @@ export interface IndividualApplication extends Application {
 
 export interface BusinessApplication extends Application {
     type: 'BusinessApplication',
+
     attributes: {
         /**
          * One of AwaitingDocuments, PendingReview, Approved, Pending, or Denied, see Application Statuses.
@@ -196,7 +192,7 @@ export interface BusinessApplication extends Application {
         /**
          * Array of beneficial owners of the business. Beneficial Owner is anyone with more than 25% ownership. Beneficial Owners would need to go over KYC process and provide documents.
          */
-        beneficialOwners: Array<BeneficialOwner>
+        beneficialOwners: BeneficialOwner[]
 
         /**
          * See [Tags](https://developers.unit.co/#tags).
@@ -244,7 +240,7 @@ export interface ApplicationDocument {
     type: "document"
 
     /**
-     * representing the document’s data.
+     * Representing the document’s data.
      */
     attributes: {
         /**
@@ -307,11 +303,11 @@ export interface CreateApplicationRequest {
 
 export interface CreateIndividualApplicationRequest extends CreateApplicationRequest {
     type: 'individualApplication'
-    attributes:
-    {
+
+    attributes: {
         /**
-        * SSN of the individual (numbers only). Either an SSN or a passport number is required.
-        */
+         * SSN of the individual (numbers only). Either an SSN or a passport number is required.
+         */
         ssn?: string
 
         /**
@@ -384,6 +380,7 @@ export interface CreateIndividualApplicationRequest extends CreateApplicationReq
 
 export interface CreateBusinessApplicationRequest extends CreateApplicationRequest {
     type: 'businessApplication'
+
     attributes: {
         /**
          * Name of the business.
diff --git a/types/core.ts b/types/core.ts
index 916989df..46bc8039 100644
--- a/types/core.ts
+++ b/types/core.ts
@@ -201,11 +201,6 @@ export interface AuthorizedUser {
      */
     fullName: FullName,
 
-    /**
-     * The authorized user's username.
-     */
-    username: string,
-
     /**
      * The authorized user's email address.
      */
@@ -251,6 +246,11 @@ export interface Coordinates {
     latitude: number
 }
 
+/**
+ * More about [Relationship](https://developers.unit.co/#relationships)
+ */
+export type Relationship = null | [] | { type: string, id: string } | Array<{ type: string, id: string }>
+
 export interface UnitResponse<T> {
     data: T
 }
@@ -266,4 +266,93 @@ export interface UnitError {
         detail?: string,
         details?: string
     }]
-}
\ No newline at end of file
+}
+
+export function createAddress(street: string, street2: string | null , city: string, state: State | null, postalCode: string, country: string): Address {
+    return {
+        street,
+        ...(street2 && { street2 }),
+        city,
+        ...(state && { state }),
+        postalCode,
+        country
+    }
+}
+
+export function createFullName(first: string, last: string) {
+    return {
+        first,
+        last
+    }
+}
+
+export function createPhone(countryCode: string, number: string) {
+    return {
+        countryCode,
+        number
+    }
+}
+
+export function createOfficer(status: Status | null, fullName: FullName, title: Title | null, ssn: string | null, passport: string | null,
+    nationality: string | null, dateOfBirth: string, address: Address, phone: Phone, email: string) {
+    return {
+        ...(status && { status }),
+        fullName,
+        ...(title && { title }),
+        ...(ssn && { ssn }),
+        ...(passport && { passport }),
+        ...(nationality && { nationality }),
+        dateOfBirth,
+        address,
+        phone,
+        email,
+    }
+}
+
+export function createBeneficialOwner(status: Status | null, fullName: FullName, ssn: string | null, passport: string | null,
+    nationality: string | null, dateOfBirth: string, address: Address, phone: Phone, email: string, percentage: string | null){
+    return {
+        ...(status && { status }),
+        fullName,
+        ...(ssn && { ssn }),
+        ...(passport && { passport }),
+        ...(nationality && { nationality }),
+        dateOfBirth,
+        address,
+        phone,
+        email,
+        ...(percentage && { percentage }),
+    }
+}
+
+export function createBusinessContact(fullName: FullName, email: string, phone: Phone) {
+    return {
+        fullName,
+        email,
+        phone
+    }
+}
+
+export function createAuthorizedUser(fullName: FullName, email: string, phone: Phone) {
+    return {
+        fullName,
+        email,
+        phone
+    }
+}
+
+export function createCounterparty(routingNumber: string, accountNumber: string, accountType: string, name: string){
+    return {
+        routingNumber,
+        accountNumber,
+        accountType,
+        name
+    }
+}
+
+export function createCoordinates(longitude: number, latitude: number) {
+    return {
+        longitude,
+        latitude
+    }
+}
diff --git a/types/customer.ts b/types/customer.ts
new file mode 100644
index 00000000..6eea366e
--- /dev/null
+++ b/types/customer.ts
@@ -0,0 +1,238 @@
+import { Address, AuthorizedUser, BusinessContact, FullName, Phone, Relationship, State } from "./core"
+
+
+export interface Customer {
+    /**
+     * Identifier of the individual resource.
+     */
+    id: string
+
+    /**
+     * Type of the resource.
+     */
+    type: 'IndividualCustomer' | 'BusinessCustomer'
+
+    /**
+     * Describes relationships between the customer resource, the Org it belongs to, and the Application it was created by.
+     */
+    relationships: {
+        /**
+         * The Org of the individual.
+         */
+        org: Relationship
+
+        /**
+         * The Application that created this individual.
+         */
+        application: Relationship
+    }
+}
+
+export interface IndividualCustomer extends Customer {
+    /**
+     * Type of the resource, the value is always individualCustomer.
+     */
+    type: 'IndividualCustomer'
+
+    /**
+     * Representing the individual data.
+     */
+    attributes: {
+        /**
+         * Date only. The date the resource was created.
+         * RFC3339 format. For more information: https://en.wikipedia.org/wiki/ISO_8601#RFCs
+         */
+        createdAt: string
+
+        /**
+         * SSN of the individual (numbers only). Either ssn or passport will be populated.
+         */
+        ssn?: string
+
+        /**
+         * Passport number of the individual. .Either ssn or passport will be populated.
+         */
+        passport?: string
+
+        /**
+         * Required on passport only. Two letters representing the individual nationality.
+         * ISO31661 - Alpha2 format. For more information: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+         */
+        nationality: string
+
+        /**
+         * Full name of the individual.
+         */
+        fullName: FullName
+
+        /**
+         * Date only.
+         * RFC3339 format. For more information: https://en.wikipedia.org/wiki/ISO_8601#RFCs
+         */
+        dateOfBirth: string
+
+        /**
+         * Address of the individual.
+         */
+        address: Address
+
+        /**
+         * Phone of the individual.
+         */
+        phone: Phone
+
+        /**
+         * Email address of the individual.
+         */
+        email: string
+
+        /**
+        * See [Tags](https://developers.unit.co/#tags).
+        */
+        tags: object
+    }
+}
+
+export interface BusinessCustomer extends Customer {
+    /**
+     * Type of the resource, the value is always businessCustomer.
+     */
+    type: 'BusinessCustomer'
+
+    /**
+     * Representing the business data.
+     */
+    attributes: {
+        /**
+         * Date only. The date the resource was created.
+         * RFC3339 format. For more information: https://en.wikipedia.org/wiki/ISO_8601#RFCs
+         */
+        createdAt: string
+
+        /**
+         * Name of the business.
+         */
+        name: string
+
+        /**
+         * Optional. “Doing business as”.
+         */
+        dba?: string
+
+        /**
+         * Address of the business.
+         */
+        address: Address
+
+        /**
+         * Phone of the business.
+         */
+        phone: Phone
+
+        /**
+         * Two letters representing a US state.
+         */
+        stateOfIncorporation: State
+
+        /**
+         * Business EIN (numbers only).
+         */
+        ein: string
+
+        /**
+         * One of "Corporation" or "LLC".
+         */
+        entityType: "Corporation" | "LLC"
+
+        /**
+         * Primary contact of the business.
+         */
+        contact: BusinessContact
+
+        /**
+         * Array of authorized users.
+         * An authorized user is someone who can participate in the One Time Password(OTP) authentication process.
+         * 
+         */
+        authorizedUsers: AuthorizedUser[]
+
+        /**
+         * See [Tags](https://developers.unit.co/#tags).
+         * Inherited from the application tags(see [Tag Inheritance](https://developers.unit.co/#tag-inheritance)).
+         */
+        tags: Object
+
+    }
+}
+
+
+export interface PatchIndividualCustomerRequest {
+    customerId: number,
+
+    data: {
+        type: 'individualCustomer'
+
+        attributes: {
+            /**
+             * Address of the individual. To modify or add specify the new address.
+             */
+            address?: Address
+
+            /**
+             * Phone of the individual. To modify or add specify the new phone number.
+             */
+            phone?: Phone
+
+            /**
+             * Email address of the individual. To modify or add specify the new email address.
+             */
+            email?: string
+
+            /**
+             * If the individual is a sole proprietor who is doing business under a different name.
+             * To modify or add specify the new dba name.
+             */
+            dba?: string
+
+            /**
+             * See (Updating Tags)[https://developers.unit.co/#tags].
+             */
+            tags?: object
+        }
+    }
+}
+
+export interface PatchBusinessCustomerRequest {
+    customerId: number,
+
+    data: {
+        type: 'businessCustomer',
+
+        attributes: {
+            /**
+             * Address of the business. To modify specify the new address.
+             */
+            address?: Address
+
+            /**
+             * Phone of the business. To modify specify the new phone number.
+             */
+            phone?: Phone
+
+            /**
+             * Primary contact of the business.	
+             */
+            contact?: BusinessContact
+
+            /**
+             * Array of authorized users. The provided array items will replace the existing ones.
+             */
+            authorizedUsers?: AuthorizedUser[]
+
+            /**
+             * See (Updating Tags)[https://developers.unit.co/#tags].
+             */
+            tags?: object
+        }
+    }
+}
\ No newline at end of file
diff --git a/types/depositAccount.ts b/types/depositAccount.ts
new file mode 100644
index 00000000..5c86140f
--- /dev/null
+++ b/types/depositAccount.ts
@@ -0,0 +1,85 @@
+import { Relationship } from "./core";
+
+export interface DepositAccount {
+    /**
+     * Identifier of the deposit account resource.
+     */
+    id: string
+
+    /**
+     * Type of the resource, the value is always depositAccount.
+     */
+    type: 'depositAccount'
+
+    /**
+     * Representing the deposit account data.
+     */
+    attributes: {
+        /**
+         * Date only. The date the resource was created.
+         * RFC3339 format. For more information: https://en.wikipedia.org/wiki/ISO_8601#RFCs
+         */
+         createdAt: string
+
+         /**
+          * Name of the account holder.
+          */
+         name: string
+
+         /**
+          * The name of the deposit product.
+          */
+         depositProduct: string
+         
+         /**
+          * Routing number of account.
+          */
+         routingNumber: string	
+
+         /**
+          * Account number, together with the routingNumber forms the identifier of the account on the ACH network.
+          */
+         accountNumber: string
+
+         /**
+          * Currency of the account.
+          * Note: the currency is currently always set to USD. The balance is represented in cents.
+          */
+         currency: string
+
+         /**
+          * The balance amount (in cents).
+          */
+         balance: number
+
+         /**
+          * The hold amount (in cents).
+          */
+         hold: number
+
+         /**
+          * The available balance for spending (in cents).
+          */
+         available: number
+
+         /**
+          * See [Tags](https://developers.unit.co/#tags).
+          */
+         tags: Object
+
+         /**
+          * Status of the account, either Open or Closed.
+          */
+         status: string
+    }
+
+    /**
+     * Describes relationships between the deposit account resource and the customer.
+     */
+    relationships: {
+        /**
+         * The customer.
+         */
+        customer: Relationship
+    }
+}
\ No newline at end of file