diff --git a/openapi/stregsystem.yaml b/openapi/stregsystem.yaml
index ba6a660b..a9034612 100644
--- a/openapi/stregsystem.yaml
+++ b/openapi/stregsystem.yaml
@@ -7,7 +7,7 @@ info:
     Existing client software utilizing the API include Stregsystem-CLI (STS) and Fappen (F-Club Web App).
     
     Disclaimer - The implementation is not generated using this specification, therefore they can get out of sync if changes are made directly to the codebase without updating the OpenAPI specification file accordingly.
-  version: "1.1"
+  version: "1.1.1"
 externalDocs:
   description: Find out more about Stregsystemet at GitHub.
   url: https://github.com/f-klubben/stregsystemet/
@@ -21,6 +21,8 @@ tags:
     description: Related to the products.
   - name: Sale
     description: Related to performing a sale.
+  - name: Signup
+    description: Related to registration of new members.
 paths:
   /api/member:
     get:
@@ -159,6 +161,38 @@ paths:
           $ref: '#/components/responses/SaleSuccess'
         '400':
           $ref: '#/components/responses/Member_RoomIdParameter_BadResponse'
+  /api/signup:
+    post:
+      tags:
+        - Signup
+      summary: Posts a signup
+      description: Performs a signup using member info.
+      operationId: api_signup
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/signup_input'
+      responses:
+        '200':
+          $ref: '#/components/responses/SignupSuccess'
+        '400':
+          $ref: '#/components/responses/Signup_BadResponse'
+  /api/signup/status:
+    get:
+      tags:
+        - Signup
+      summary: Gets status regarding a signup
+      description: Retrieves the signup status for a specific member by username.
+      operationId: api_signup_status
+      parameters:
+        - $ref: '#/components/parameters/username_param'
+      responses:
+        '200':
+          $ref: '#/components/responses/SignupStatus'
+        '400':
+          $ref: '#/components/responses/MemberUsernameParameter_BadResponse'
 components:
   examples:
     MemberNotFoundExample:
@@ -182,7 +216,20 @@ components:
     MissingMemberUsernameExample:
       summary: No username given
       value: "Parameter missing: username"
+    UsernameTakenExample:
+      summary: Member with that username already exist
+      value: "Username taken"
+    MissingOrInvalidParameterExample:
+      summary: A parameter is invalid or missing
+      value: "Parameter invalid: <parameter>"
   parameters:
+    signup_id_param:
+      name: signup_id
+      in: query
+      description: Signup ID of the signup to retrieve.
+      required: true
+      schema:
+        $ref: '#/components/schemas/signup_id'
     member_id_param:
       name: member_id
       in: query
@@ -239,6 +286,12 @@ components:
     missingMemberUsernameMessage:
       type: string
       example: "Parameter missing: username"
+    usernameTakenMessage:
+      type: string
+      example: "Username taken"
+    invalidParameterMessage:
+      type: string
+      example: "Parameter invalid: <parameter>"
     balance:
       type: integer
       example: 20000
@@ -257,6 +310,35 @@ components:
     room_id:
       type: integer
       example: 10
+    email:
+      type: string
+      format: email
+      example: kresten@example.org
+    firstname:
+      type: string
+      example: Kresten
+    lastname:
+      type: string
+      example: Laust
+    education:
+      type: string
+      description: Acknowledged shortening, e.g. sw/ixd/dad/dat
+      example: sw
+    gender:
+      type: string
+      enum:
+        - U
+        - M
+        - F
+      example: M
+    approval_status:
+      type: string
+      description: U = Unreviewed, A = Approved, I = Ignored, R = Rejected.
+      enum:
+        - U
+        - A
+        - I
+        - R
     timestamp:
       type: string
       format: date-time
@@ -274,6 +356,9 @@ components:
       type: integer
       example: 1800
     stregoere_balance:
+      type: integer
+      example: 15000
+    stregoere_due:
       type: integer
       example: 20000
     stregkroner_balance:
@@ -281,6 +366,14 @@ components:
       type: number
       format: float
       example: 182.00
+    signup_id:
+      type: integer
+      example: 5
+    named_products_example:
+      type: object
+      properties:
+        beer:
+          $ref: '#/components/schemas/product_id'
     sale_input:
       type: object
       properties:
@@ -290,6 +383,21 @@ components:
           $ref: '#/components/schemas/buystring'
         room:
           $ref: '#/components/schemas/room_id'
+    signup_input:
+      type: object
+      properties:
+        education:
+          $ref: '#/components/schemas/education'
+        username:
+          $ref: '#/components/schemas/username'
+        email:
+          $ref: '#/components/schemas/email'
+        firstname:
+          $ref: '#/components/schemas/firstname'
+        lastname:
+          $ref: '#/components/schemas/lastname'
+        gender:
+          $ref: '#/components/schemas/gender'
     active_product:
       type: object
       properties:
@@ -359,6 +467,13 @@ components:
     member_has_low_balance:
       type: boolean
       example: false
+    signup_values_result_example:
+      type: object
+      properties:
+        due:
+          $ref: '#/components/schemas/stregoere_due'
+        username:
+          $ref: '#/components/schemas/username'
     sale_values_result_example:
       type: object
       properties:
@@ -472,6 +587,17 @@ components:
             properties:
               sales:
                 $ref: '#/components/schemas/sales'
+    SignupStatus:
+      description: Signup information found.
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              due:
+                $ref: '#/components/schemas/stregoere_due'
+              status:
+                $ref: '#/components/schemas/approval_status'
     NamedProducts:
       description: Dictionary of all named_product names.
       content:
@@ -511,6 +637,21 @@ components:
                 example: "OK"
               values:
                 $ref: '#/components/schemas/sale_values_result_example'
+    SignupSuccess:
+      description: An object containing info regarding the signup.
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              status:
+                type: integer
+                example: 200
+              msg:
+                type: string
+                example: "OK"
+              values:
+                $ref: '#/components/schemas/signup_values_result_example'
     QRCodeGenerated:
       description: QR code with link to open MobilePay with the provided information.
       content:
@@ -594,3 +735,16 @@ components:
               $ref: '#/components/examples/InvalidRoomIdExample'
             missingRoomId:
               $ref: '#/components/examples/MissingRoomIdExample'
+    Signup_BadResponse:
+      description: Username is taken, missing parameter, or invalid parameter.
+      content:
+        text/html:
+          schema:
+            oneOf:
+              - $ref: '#/components/schemas/usernameTakenMessage'
+              - $ref: '#/components/schemas/invalidParameterMessage'
+          examples:
+            usernameTaken:
+              $ref: '#/components/examples/UsernameTakenExample'
+            invalidParameter:
+              $ref: '#/components/examples/MissingOrInvalidParameterExample'
diff --git a/stregsystem/tests.py b/stregsystem/tests.py
index bf953762..c86c07ae 100644
--- a/stregsystem/tests.py
+++ b/stregsystem/tests.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 import datetime
+import json
 from collections import Counter
 from copy import deepcopy
 from unittest import mock
@@ -2272,3 +2273,75 @@ def test_welcome_mail_paid_approved(self, mock_mail_method: MagicMock):
 
         signup_request.approve()
         mock_mail_method.assert_called_once()
+
+
+class ApiTests(TestCase):
+    """
+    A lot of the API testing is done separately using Dredd and OpenAPI.
+    These are edge-cases which can't be expressed in OpenAPI.
+    """
+
+    def setUp(self):
+        member = Member.objects.create(username="martin_p", email="test@example.com", signup_due_paid=False)
+        member.save()
+
+    def test_signup_duplicate_username(self):
+        response = self.client.post(
+            reverse('api_signup'),
+            json.dumps(
+                {
+                    'education': "sw",
+                    'username': "martin_p",  # Note: Duplicate username
+                    'firstname': "Martin",
+                    'lastname': "P.",
+                    'email': "test2@example.com",
+                    'gender': "M",
+                }
+            ),
+            content_type="application/json",
+        )
+
+        self.assertNotEquals(response.status_code, 200)
+
+    def test_signup_partial_form_no_name(self):
+        response = self.client.post(
+            reverse('api_signup'),
+            json.dumps({'education': "sw", 'username': "martin_p2", 'email': "test2@example.com", 'gender': "M"}),
+            content_type="application/json",
+        )
+
+        self.assertNotEquals(response.status_code, 200)
+
+    def test_signup_partial_form_no_username(self):
+        response = self.client.post(
+            reverse('api_signup'),
+            json.dumps(
+                {
+                    'education': "sw",
+                    'firstname': "Martin",
+                    'lastname': "P.",
+                    'email': "test2@example.com",
+                    'gender': "M",
+                }
+            ),
+            content_type="application/json",
+        )
+
+        self.assertNotEquals(response.status_code, 200)
+
+    def test_signup_partial_form_no_education(self):
+        response = self.client.post(
+            reverse('api_signup'),
+            json.dumps(
+                {
+                    'username': "martin_p2",
+                    'firstname': "Martin",
+                    'lastname': "P.",
+                    'email': "test2@example.com",
+                    'gender': "M",
+                }
+            ),
+            content_type="application/json",
+        )
+
+        self.assertNotEquals(response.status_code, 200)
diff --git a/stregsystem/urls.py b/stregsystem/urls.py
index 9fbbe9bb..e6e576db 100644
--- a/stregsystem/urls.py
+++ b/stregsystem/urls.py
@@ -43,4 +43,6 @@
     re_path(r'^api/products/active_products$', views.get_active_items, name="api_active_products"),
     re_path(r'^api/products/category_mappings$', views.get_product_category_mappings, name="api_product_mappings"),
     re_path(r'^api/sale$', views.api_sale, name="api_sale"),
+    re_path(r'^api/signup$', views.post_signup, name="api_signup"),
+    re_path(r'^api/signup/status', views.get_signup_status, name="api_signup_status"),
 ]
diff --git a/stregsystem/views.py b/stregsystem/views.py
index dcc14c13..05b6bf84 100644
--- a/stregsystem/views.py
+++ b/stregsystem/views.py
@@ -16,6 +16,7 @@
 from django.contrib.admin.views.decorators import staff_member_required
 from django.contrib.auth.decorators import permission_required
 from django.core import management
+from django.core.exceptions import ValidationError
 from django.db.models import Q, Count, Sum
 from django.forms import modelformset_factory
 from django.http import HttpResponsePermanentRedirect, HttpResponseBadRequest, JsonResponse
@@ -594,6 +595,28 @@ def get_payment_qr(request):
     return qr_code(mobilepay_launch_uri(username, amount))
 
 
+def perform_signup(validated_form: SignupForm) -> PendingSignup:
+    if not validated_form.is_valid():
+        raise ValidationError("The provided form contains errors: %s" % validated_form.errors)
+
+    if Member.objects.filter(username=validated_form.cleaned_data.get('username')).all().count() > 0:
+        raise ValidationError("Username already taken")
+
+    member = Member.objects.create(
+        username=validated_form.cleaned_data.get('username'),
+        firstname=validated_form.cleaned_data.get('firstname'),
+        lastname=validated_form.cleaned_data.get('lastname'),
+        email=validated_form.cleaned_data.get('email'),
+        notes=validated_form.cleaned_data.get('notes'),
+        gender=validated_form.cleaned_data.get('gender'),
+        signup_due_paid=False,
+    )
+    signup_request = PendingSignup(member=member, due=200 * 100)
+    signup_request.save()
+
+    return signup_request
+
+
 def signup(request):
     is_post = request.method == "POST"
     form = SignupForm(request.POST) if is_post else SignupForm()
@@ -603,19 +626,9 @@ def signup(request):
             form.add_error("username", "Brugernavn allerede i brug")
             return render(request, "stregsystem/signup.html", locals())
 
-        member = Member.objects.create(
-            username=form.cleaned_data.get('username'),
-            firstname=form.cleaned_data.get('firstname'),
-            lastname=form.cleaned_data.get('lastname'),
-            email=form.cleaned_data.get('email'),
-            notes=form.cleaned_data.get('notes'),
-            gender=form.cleaned_data.get('gender'),
-            signup_due_paid=False,
-        )
-        signup_request = PendingSignup(member=member, due=200 * 100)
-        signup_request.save()
+        pending_signup = perform_signup(form)
 
-        return redirect('signup_status', signup_id=signup_request.id)
+        return redirect('signup_status', signup_id=pending_signup.id)
 
     return render(request, "stregsystem/signup.html", locals())
 
@@ -763,6 +776,58 @@ def get_named_products(request):
     return JsonResponse(items_dict, json_dumps_params={'ensure_ascii': False})
 
 
+def get_signup_status(request):
+    username = request.GET.get('username') or None
+    if username is None:
+        return HttpResponseBadRequest("Parameter missing: username")
+
+    try:
+        member = Member.objects.get(username=username)
+    except Member.DoesNotExist:
+        return HttpResponseBadRequest("Member not found")
+
+    try:
+        pending_signup = PendingSignup.objects.get(member=member)
+        return JsonResponse({'due': pending_signup.due, 'status': pending_signup.status})
+    except PendingSignup.DoesNotExist:
+        # Member exists but no signup object does, assume it was approved.
+        return JsonResponse({'due': 0, 'status': ApprovalModel.APPROVED})
+
+
+@csrf_exempt
+def post_signup(request):
+    if request.method != "POST":
+        return HttpResponseBadRequest()
+    else:
+        try:
+            data = json.loads(request.body)
+        except json.JSONDecodeError:
+            return HttpResponseBadRequest("Invalid JSON payload.")
+
+        signup_form = SignupForm(data)
+
+        if not signup_form.is_valid():
+            return HttpResponseBadRequest(f"Parameter invalid: {', '.join(signup_form.errors.keys())}")
+
+        try:
+            pending_signup = perform_signup(signup_form)
+        except ValidationError as err:
+            return HttpResponseBadRequest(err.message)
+
+        msg, status, ret_obj = (
+            "OK",
+            200,
+            {
+                'due': pending_signup.due,
+                'username': pending_signup.member.username,
+            },
+        )
+
+        return JsonResponse(
+            {'status': status, 'msg': msg, 'values': ret_obj}, json_dumps_params={'ensure_ascii': False}
+        )
+
+
 @csrf_exempt
 def api_sale(request):
     if request.method != "POST":