diff --git a/lib/bigcommerce/api/customers/handlers/signup.ts b/lib/bigcommerce/api/customers/handlers/signup.ts
new file mode 100644
index 000000000..85400e39b
--- /dev/null
+++ b/lib/bigcommerce/api/customers/handlers/signup.ts
@@ -0,0 +1,68 @@
+import { BigcommerceApiError } from '../../utils/errors'
+import login from '../../operations/login'
+import { SignupHandlers } from '../signup'
+
+const signup: SignupHandlers['signup'] = async ({
+  res,
+  body: { firstName, lastName, email, password },
+  config,
+}) => {
+  // TODO: Add proper validations with something like Ajv
+  if (!(firstName && lastName && email && password)) {
+    return res.status(400).json({
+      data: null,
+      errors: [{ message: 'Invalid request' }],
+    })
+  }
+  // TODO: validate the password and email
+  // Passwords must be at least 7 characters and contain both alphabetic
+  // and numeric characters.
+
+  let result: { data?: any } = {}
+
+  try {
+    result = await config.storeApiFetch('/v3/customers', {
+      method: 'POST',
+      body: JSON.stringify([
+        {
+          first_name: firstName,
+          last_name: lastName,
+          email,
+          authentication: {
+            new_password: password,
+          },
+        },
+      ]),
+    })
+  } catch (error) {
+    if (error instanceof BigcommerceApiError && error.status === 422) {
+      const hasEmailError = '0.email' in error.data?.errors
+
+      // If there's an error with the email, it most likely means it's duplicated
+      if (hasEmailError) {
+        return res.status(400).json({
+          data: null,
+          errors: [
+            {
+              message: 'The email is already in use',
+              code: 'duplicated_email',
+            },
+          ],
+        })
+      }
+    }
+
+    throw error
+  }
+
+  console.log('DATA', result.data)
+
+  // TODO: Currently not working, fix this asap.
+  const loginData = await login({ variables: { email, password }, config })
+
+  console.log('LOGIN DATA', loginData)
+
+  res.status(200).json({ data: result.data ?? null })
+}
+
+export default signup
diff --git a/lib/bigcommerce/api/customers/signup.ts b/lib/bigcommerce/api/customers/signup.ts
new file mode 100644
index 000000000..aa26f78cf
--- /dev/null
+++ b/lib/bigcommerce/api/customers/signup.ts
@@ -0,0 +1,50 @@
+import createApiHandler, {
+  BigcommerceApiHandler,
+  BigcommerceHandler,
+} from '../utils/create-api-handler'
+import isAllowedMethod from '../utils/is-allowed-method'
+import { BigcommerceApiError } from '../utils/errors'
+import signup from './handlers/signup'
+
+export type SignupBody = {
+  firstName: string
+  lastName: string
+  email: string
+  password: string
+}
+
+export type SignupHandlers = {
+  signup: BigcommerceHandler<null, { cartId?: string } & Partial<SignupBody>>
+}
+
+const METHODS = ['POST']
+
+const signupApi: BigcommerceApiHandler<null, SignupHandlers> = async (
+  req,
+  res,
+  config,
+  handlers
+) => {
+  if (!isAllowedMethod(req, res, METHODS)) return
+
+  const { cookies } = req
+  const cartId = cookies[config.cartCookie]
+
+  try {
+    const body = { ...req.body, cartId }
+    return await handlers['signup']({ req, res, config, body })
+  } catch (error) {
+    console.error(error)
+
+    const message =
+      error instanceof BigcommerceApiError
+        ? 'An unexpected error ocurred with the Bigcommerce API'
+        : 'An unexpected error ocurred'
+
+    res.status(500).json({ data: null, errors: [{ message }] })
+  }
+}
+
+const handlers = { signup }
+
+export default createApiHandler(signupApi, handlers, {})