diff --git a/app/webhooks.rb b/app/webhooks.rb
index e966d67e..8a5db059 100644
--- a/app/webhooks.rb
+++ b/app/webhooks.rb
@@ -1,7 +1,60 @@
 post '/webhooks/paypal' do
+  return 403 unless valid_paypal_webhook_source?
+
+  if paypal_subscription_ended_ipn?
+    site = paypal_ipn_site
+
+    if site
+      stripe_active = site.stripe_paying_supporter?
+
+      site.paypal_active = false
+      site.paypal_profile_id = nil
+      site.paypal_token = nil
+
+      unless stripe_active
+        site.plan_type = nil
+        site.plan_ended = true
+      end
+
+      site.save_changes validate: false
+
+      unless stripe_active
+        EmailWorker.perform_async({
+          from:    Site::FROM_EMAIL,
+          to:      site.email,
+          subject: '[Neocities] Supporter plan has ended',
+          body:    Tilt.new('./views/templates/email/supporter_ended.erb', pretty: true).render(self)
+        })
+      end
+    end
+  end
+
   'ok'
 end
 
+def paypal_subscription_ended_ipn?
+  %w[
+    recurring_payment_profile_cancel
+    recurring_payment_expired
+    recurring_payment_suspended
+    recurring_payment_suspended_due_to_max_failed_payment
+    subscr_cancel
+    subscr_eot
+  ].include?(params[:txn_type].to_s)
+end
+
+def paypal_ipn_site
+  profile_id = params[:recurring_payment_id] ||
+    params[:recurring_payment_profile_id] ||
+    params[:rp_profile_id] ||
+    params[:profile_id] ||
+    params[:subscr_id]
+
+  return nil if profile_id.blank?
+
+  Site.where(paypal_profile_id: profile_id).first
+end
+
 def valid_paypal_webhook_source?
   return true if self.class.test?
   return true if request.ip == '127.0.0.1'
diff --git a/tests/webhook_tests.rb b/tests/webhook_tests.rb
index d1912178..4ba365cd 100644
--- a/tests/webhook_tests.rb
+++ b/tests/webhook_tests.rb
@@ -66,6 +66,70 @@ describe 'tipping' do
   end
 end
 
+describe 'paypal supporter IPN' do
+  include Rack::Test::Methods
+
+  def app
+    Sinatra::Application
+  end
+
+  before do
+    EmailWorker.jobs.clear
+    @site = Fabricate :site
+    @site.update(
+      paypal_active: true,
+      paypal_profile_id: 'I-123',
+      paypal_token: 'EC-123',
+      plan_type: 'supporter',
+      plan_ended: false
+    )
+  end
+
+  it 'ends a PayPal supporter membership when PayPal cancels the recurring profile' do
+    post '/webhooks/paypal', paypal_supporter_ipn_hash
+
+    _(last_response.status).must_equal 200
+    @site.reload
+    _(@site.values[:paypal_active]).must_equal false
+    _(@site.paypal_profile_id).must_be_nil
+    _(@site.paypal_token).must_be_nil
+    _(@site.values[:plan_type]).must_be_nil
+    _(@site.plan_ended).must_equal true
+
+    _(EmailWorker.jobs.length).must_equal 1
+    args = EmailWorker.jobs.first['args'].first
+    _(args['to']).must_equal @site.email
+    _(args['subject']).must_equal '[Neocities] Supporter plan has ended'
+  end
+
+  it 'clears stale PayPal fields without ending an active Stripe membership' do
+    @site.update(
+      stripe_customer_id: 'cus_123',
+      stripe_subscription_id: 'sub_123',
+      plan_type: 'supporter',
+      plan_ended: false
+    )
+
+    post '/webhooks/paypal', paypal_supporter_ipn_hash
+
+    _(last_response.status).must_equal 200
+    @site.reload
+    _(@site.values[:paypal_active]).must_equal false
+    _(@site.paypal_profile_id).must_be_nil
+    _(@site.paypal_token).must_be_nil
+    _(@site.values[:plan_type]).must_equal 'supporter'
+    _(@site.plan_ended).must_equal false
+    _(EmailWorker.jobs.length).must_equal 0
+  end
+end
+
+def paypal_supporter_ipn_hash(opts={})
+  {
+    txn_type: 'recurring_payment_profile_cancel',
+    recurring_payment_id: 'I-123'
+  }.merge(opts)
+end
+
 def paypal_tip_webhook_hash(opts={})
   {
     :transaction_subject=>"customvarlol",