diff --git a/rowers/integrations/intervals.py b/rowers/integrations/intervals.py
index 042b5eff..182a8863 100644
--- a/rowers/integrations/intervals.py
+++ b/rowers/integrations/intervals.py
@@ -1,6 +1,7 @@
 from .integrations import SyncIntegration, NoTokenError, create_or_update_syncrecord, get_known_ids
-from rowers.models import Rower, User, Workout, TombStone
+from rowers.models import Rower, User, Workout, TombStone, PlannedSession
 from rowingdata import rowingdata
+from rowers.rower_rules import user_is_not_basic, user_is_coachee
 
 from rowers import mytypes
 
@@ -49,6 +50,8 @@ headers = {
 intervals_authorize_url = 'https://intervals.icu/oauth/authorize?'
 intervals_token_url = 'https://intervals.icu/api/oauth/token'
 
+webhookverification = 'JA9Vt6RNH10'
+
 class IntervalsIntegration(SyncIntegration):
     def __init__(self, *args, **kwargs):
         super(IntervalsIntegration, self).__init__(*args, **kwargs)
@@ -335,6 +338,28 @@ class IntervalsIntegration(SyncIntegration):
         data = response.json()
 
         return data
+
+    def update_plannedsession(self, ps, data, *args, **kwargs):
+        _ = self.open()
+        r = self.rower
+
+        if data['category'] == 'WORKOUT':
+            url = self.oauth_data['base_url'] + 'athlete/0/events/' + str(ps.intervals_icu_id) + '/downloadfit'
+            headers = {
+                'Authorization': 'Bearer ' + r.intervals_token,
+            }
+            response = requests.get(url, headers=headers)
+            if response.status_code != 200:
+                dologging('intervals.icu.log', response.text)
+            else:
+                filename = 'planned_' + str(ps.intervals_icu_id) + '.fit'
+                filename2 = 'media/planned_' + str(ps.intervals_icu_id) + '.fit'
+                with open(filename2, 'wb') as f:
+                    f.write(response.content)
+
+                data['fitfile'] = filename
+
+        return data
         
     def get_plannedsession(self, id, *args, **kwargs):
         _ = self.open()
@@ -396,6 +421,7 @@ class IntervalsIntegration(SyncIntegration):
             "name": ps.name,
             "description": stepstext,
             "indoor": ps.sessionsport in mytypes.ergtypes,
+            'external_id': ps.id,
         }
 
         if ps.sessiontype == 'cycletarget':
@@ -442,3 +468,119 @@ class IntervalsIntegration(SyncIntegration):
         ps.save()
 
         return 1
+
+    def update_calendar(self, r, event, *args, **kwargs):
+        try:
+            records = event["events"]
+        except KeyError:
+            records = []
+
+        for record in records:
+            id = record['id']
+            data = {}
+            try:
+                pss = PlannedSession.objects.filter(intervals_icu_id=id)
+                if pss.count() > 0:
+                    ps = pss[0]
+                    data = self.update_plannedsession(ps, record)
+                else:
+                    data = self.get_plannedsession(id)
+                    ps = PlannedSession(
+                        manager=r.user,
+                        intervals_icu_id=id,
+                    )
+                    ps.save()
+                    ps.rower.add(r)
+            except PlannedSession.DoesNotExist:
+                continue
+
+            # got data
+            if data:
+                ps.name = data['name']
+                ps.comment = data['description']
+                ps.startdate = arrow.get(data['start_date_local']).datetime
+                ps.enddate = arrow.get(data['end_date_local']).datetime
+                ps.preferreddate = arrow.get(data['start_date_local']).datetime
+                ps.sessionsport = mytypes.intervalsmappinginv[data['type']]
+                ps.sessiontype = 'session'
+                ps.save()
+                try:
+                    timetarget = data['time_target']
+                except KeyError:
+                    timetarget = None
+                if timetarget is None:
+                    try:
+                        timetarget = data['moving_time']
+                    except KeyError:
+                        timetarget = None
+                    if timetarget is None:
+                        timetarget = 3600
+                timetarget = int(timetarget)/60.
+                ps.sessionvalue = timetarget
+                ps.save()
+                if data['category'].lower() == 'workout':
+                    ps.fitfile = data['fitfile']
+                    ps.save()
+                    ps.update_steps()
+                if data['category'].lower() == 'target':
+                    ps.sessiontype = 'cycletarget'
+                    ps.sessionvalue = int(data['time_target'])/60.
+                    ps.enddate = ps.startdate + datetime.timedelta(days=6)
+                    ps.save()
+
+        try:
+            deleted_records = event["deleted_events"]
+        except KeyError:
+            deleted_records = []
+
+        for record in deleted_records:
+            id = record['id']
+            try:
+                pss = PlannedSession.objects.filter(intervals_icu_id=id)
+                if r.intervals_delete_plannedsession and pss.count() > 0:
+                    for ps in pss:
+                        ps.delete()
+            except PlannedSession.DoesNotExist:
+                continue
+
+        return 1
+
+    def import_activities(self, event, *args, **kwargs):
+        if not self.rower.intervals_auto_import:
+            return 0
+        if user_is_not_basic(self.rower.user) or user_is_coachee(self.rower.user):
+            try:
+                record = event["activity"]
+            except KeyError:
+                records = []
+
+            try:
+                id = record['id']
+                result = self.get_workout(id)
+            except KeyError:
+                pass
+
+            return 1
+
+        return 0
+
+    def delete_activities(self, event, *args, **kwargs):
+        if not self.rower.intervals_auto_delete:
+            return 0
+        try:
+            record = event["activity"]
+        except KeyError:
+            records = []
+
+        try:
+            id = record['id']
+            try:
+                w = Workout.objects.get(uploadedtointervals=id)
+                if w.user == self.rower:
+                    w.delete()
+            except Workout.DoesNotExist:
+                pass
+        except KeyError:
+            pass
+
+        return 1
diff --git a/rowers/models.py b/rowers/models.py
index 587de999..40195356 100644
--- a/rowers/models.py
+++ b/rowers/models.py
@@ -1176,6 +1176,7 @@ class Rower(models.Model):
     intervals_auto_export = models.BooleanField(default=False)
     intervals_auto_import = models.BooleanField(default=False)
     intervals_delete_plannedsession = models.BooleanField(default=False, verbose_name="Deleting planned session deletes it on intervals.icu")
+    intervals_auto_delete = models.BooleanField(default=True, verbose_name="Deleting an activity on intervals.icu deletes it on both")
     intervals_resample_to_1s = models.BooleanField(default=False, verbose_name='Resample to 1s on export')
     sporttrackstoken = models.CharField(
         default='', max_length=200, blank=True, null=True)
@@ -4676,6 +4677,7 @@ class RowerExportForm(ModelForm):
             'intervals_auto_export',
             'intervals_delete_plannedsession',
             'intervals_resample_to_1s',
+            'intervals_auto_delete',
             'imports_are_private'
         ]
 
@@ -4703,6 +4705,7 @@ class RowerExportFormIntervals(ModelForm):
             'intervals_auto_import',
             'intervals_auto_export',
             'intervals_resample_to_1s',
+            'intervals_auto_delete',
             'intervals_delete_plannedsession',
         ]
 
diff --git a/rowers/tests/testdata/testdata.tcx.gz b/rowers/tests/testdata/testdata.tcx.gz
index 1385fa85..088c98c4 100644
Binary files a/rowers/tests/testdata/testdata.tcx.gz and b/rowers/tests/testdata/testdata.tcx.gz differ
diff --git a/rowers/urls.py b/rowers/urls.py
index aa39292b..ccb49dc7 100644
--- a/rowers/urls.py
+++ b/rowers/urls.py
@@ -633,6 +633,7 @@ urlpatterns = [
             name='workout_rojaboimport_view'),
     re_path(r'^session/intervalsimport/$', views.plannedsession_intervalsimport_view,
             name='plannedsession_intervalsimport_view'),
+    re_path(r'^session/intervals/webhook/$', views.intervals_webhook_view, name='intervals_webhook_view'),
     re_path(r'^workout/(?P<source>\w+.*)import/$',
             views.workout_import_view, name='workout_import_view'),
     re_path(r'^workout/(?P<source>\w+.*)import/(?P<externalid>\d+)/$',
diff --git a/rowers/views/importviews.py b/rowers/views/importviews.py
index c1d05ef9..30cd7b7b 100644
--- a/rowers/views/importviews.py
+++ b/rowers/views/importviews.py
@@ -10,7 +10,9 @@ from rowers.utils import NoTokenError
 from rowers.models import PlannedSession
 
 import rowers.integrations.strava as strava
+import rowers.integrations.intervals as intervals
 from rowers.integrations import importsources
+from rowers.integrations import IntervalsIntegration
 from rowers.utils import NoTokenError
 
 import numpy
@@ -913,9 +915,62 @@ def workout_rojaboimport_view(request, message="", userid=0): # pragma: no cover
 
 
 
+
+@csrf_exempt
+def intervals_webhook_view(request):
+    if request.method == 'GET':
+        verificationtoken = request.GET.get('secret')
+        if verificationtoken != intervals.webhookverification:
+            return HttpResponse(status=403)
+
+        dologging("intervals_webhooks.log","GET request")
+        dologging("intervals_webhooks.log",request.body)
+
+    else:
+        data = json.loads(request.body)
+        try:
+            verificationtoken = data['secret']
+        except KeyError:
+            return HttpResponse(status=403)
+        if verificationtoken != intervals.webhookverification:
+            return HttpResponse(status=403)
+        try:
+            events = data['events']
+        except KeyError:
+            # return invalid request if no events
+            return HttpResponse(status=200)
+
+        webhook_type = None
+
+
+        for event in events:
+            try:
+                athlete_id = event['athlete_id']
+                webhook_type = event['type']
+                r = Rower.objects.get(intervals_owner_id=athlete_id)
+            except Rower.DoesNotExist:
+                return HttpResponse(status=200)
+            except MultipleObjectsReturned:
+                rs = Rower.objects.filter(intervals_owner_id=athlete_id)
+                r = rs[0]
+            except KeyError:
+                return HttpResponse(status=200)
+
+            integration = IntervalsIntegration(r.user)
+
+            if webhook_type.lower() == 'calendar_updated':
+                integration.update_calendar(r, event)
+
+            if webhook_type.lower() == 'activity_uploaded':
+                integration.import_activities(event)
+
+            if webhook_type.lower() == 'activity_deleted':
+                integration.delete_activities(event)
+
+    return HttpResponse(status=200)
+        
+        
 # for Strava webhook request validation
-
-
 @csrf_exempt
 def strava_webhook_view(request):
     if request.method == 'GET':