Change service billing details

View page that lets you change service billing details and
update details on form submission.

app/main/forms.py

@@ -1686,6 +1686,13 @@ class EditServiceNotesForm(StripWhitespaceForm):
     notes = TextAreaField(validators=[])
 
 
+class ServiceBillingDetailsForm(StripWhitespaceForm):
+    billing_contact_email_address = GovukTextInputField('Billing contact email address')
+    billing_contact_name = GovukTextInputField('Billing contact name')
+    billing_reference = GovukTextInputField('Billing reference')
+    purchase_order_number = GovukTextInputField('Purchase order number')
+
+
 class ServiceLetterContactBlockForm(StripWhitespaceForm):
     letter_contact_block = TextAreaField(
         validators=[

app/main/views/service_settings.py

@@ -43,6 +43,7 @@ from app.main.forms import (
     RateLimit,
     RenameServiceForm,
     SearchByNameForm,
+    ServiceBillingDetailsForm,
     ServiceContactDetailsForm,
     ServiceDataRetentionEditForm,
     ServiceDataRetentionForm,
@@ -1213,7 +1214,26 @@ def edit_service_notes(service_id):
 @main.route("/services/<uuid:service_id>/edit-billing-details", methods=['GET', 'POST'])
 @user_is_platform_admin
 def edit_service_billing_details(service_id):
-    pass
+    form = ServiceBillingDetailsForm(
+        billing_contact_email_address=current_service.billing_contact_email_address,
+        billing_contact_name=current_service.billing_contact_name,
+        billing_reference=current_service.billing_reference,
+        purchase_order_number=current_service.purchase_order_number
+    )
+
+    if form.validate_on_submit():
+        current_service.update(
+            billing_contact_email_address=form.billing_contact_email_address.data,
+            billing_contact_name=form.billing_contact_name.data,
+            billing_reference=form.billing_reference.data,
+            purchase_order_number=form.purchase_order_number.data
+        )
+        return redirect(url_for('.service_settings', service_id=service_id))
+
+    return render_template(
+        'views/service-settings/edit-service-billing-details.html',
+        form=form,
+    )
 
 
 def get_branding_as_value_and_label(email_branding):

app/notify_client/service_api_client.py

@@ -80,10 +80,13 @@ class ServiceAPIClient(NotifyAdminAPIClient):
         data = _attach_current_user(kwargs)
         disallowed_attributes = set(data.keys()) - {
             'active',
+            'billing_contact_email_address',
+            'billing_contact_name',
+            'billing_reference',
             'consent_to_research',
             'contact_link',
-            'count_as_live',
             'created_by',
+            'count_as_live',
             'email_branding',
             'email_from',
             'free_sms_fragment_limit',
@@ -97,6 +100,7 @@ class ServiceAPIClient(NotifyAdminAPIClient):
             'organisation_type',
             'permissions',
             'prefix_sms',
+            'purchase_order_number',
             'rate_limit',
             'reply_to_email_address',
             'research_mode',

app/templates/views/service-settings/edit-service-billing-details.html

@@ -0,0 +1,26 @@
+
+{% extends "withnav_template.html" %}
+{% from "components/page-header.html" import page_header %}
+{% from "components/page-footer.html" import page_footer %}
+{% from "components/form.html" import form_wrapper %}
+
+{% block service_page_title %}
+  Change service billing details
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  {{ page_header(
+    'Change service billing details',
+    back_link=url_for('main.service_settings', service_id=current_service.id)
+  ) }}
+
+  {% call form_wrapper() %}
+    {{ form.billing_contact_name }}
+    {{ form.billing_contact_email_address }}
+    {{ form.billing_reference }}
+    {{ form.purchase_order_number }}
+    {{ page_footer('Save') }}
+  {% endcall %}
+
+{% endblock %}

tests/app/main/views/test_service_settings.py

@@ -5300,3 +5300,54 @@ def test_service_settings_links_to_edit_service_billing_details_page_for_platfor
     ))
     page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
     assert len(page.find_all('a', attrs={'href': '/services/{}/edit-billing-details'.format(SERVICE_ONE_ID)})) == 1
+
+
+def test_view_edit_service_billing_details(
+        platform_admin_client,
+        service_one,
+
+):
+    response = platform_admin_client.get(url_for('main.edit_service_billing_details', service_id=SERVICE_ONE_ID))
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+    assert page.select_one('h1').text == "Change service billing details"
+    labels = page.find_all('label', class_="form-label")
+    labels_list = [
+        'Billing contact email address', 'Billing contact name', 'Billing reference', 'Purchase order number'
+    ]
+    for label in labels:
+        assert label.text.strip() in labels_list
+    textbox_names = page.find_all('input', class_='govuk-input govuk-!-width-two-thirds')
+    names_list = ['billing_contact_email_address', 'billing_contact_name', 'billing_reference', 'purchase_order_number']
+
+    for name in textbox_names:
+        assert name.attrs["name"] in names_list
+
+
+def test_update_service_billing_details(
+        platform_admin_client,
+        service_one,
+        mock_update_service
+):
+    response = platform_admin_client.post(
+        url_for(
+            'main.edit_service_billing_details',
+            service_id=SERVICE_ONE_ID,
+        ),
+        data={
+            'billing_contact_email_address': 'accounts@fluff.gov.uk',
+            'billing_contact_name': 'Flannellette von Fluff',
+            'billing_reference': '',
+            'purchase_order_number': 'PO1234'
+        }
+    )
+    assert response.status_code == 302
+    settings_url = url_for(
+        'main.service_settings', service_id=SERVICE_ONE_ID, _external=True)
+    assert response.location == settings_url
+    mock_update_service.assert_called_with(
+        SERVICE_ONE_ID,
+        billing_contact_email_address='accounts@fluff.gov.uk',
+        billing_contact_name='Flannellette von Fluff',
+        billing_reference='',
+        purchase_order_number='PO1234'
+    )