diff --git a/doc/api/resources/checkinlists.rst b/doc/api/resources/checkinlists.rst
index 3b6f506f4e..5d04d7d0bc 100644
--- a/doc/api/resources/checkinlists.rst
+++ b/doc/api/resources/checkinlists.rst
@@ -351,7 +351,8 @@ Endpoints
 
    :<json boolean error_reason: One of ``canceled``, ``invalid``, ``unpaid``, ``product``, ``rules``, ``revoked``,
                                 ``incomplete``, ``already_redeemed``, ``blocked``, ``invalid_time``, or ``error``. Required.
-   :<json raw_barcode: The raw barcode you scanned. Required.
+   :<json raw_barcode: The raw barcode or identifier you scanned. Required.
+   :<json raw_source_type: The type of medium you scanned, defaults to ``barcode``. Optional.
    :<json datetime: Date and time of the scan. Optional.
    :<json type: Type of scan, defaults to ``"entry"``.
    :<json position: Internal ID of an order position you matched. Optional.
diff --git a/src/pretix/api/serializers/order.py b/src/pretix/api/serializers/order.py
index 704b24f496..418dbc00f9 100644
--- a/src/pretix/api/serializers/order.py
+++ b/src/pretix/api/serializers/order.py
@@ -52,6 +52,7 @@ from pretix.api.signals import order_api_details, orderposition_api_details
 from pretix.base.decimal import round_decimal
 from pretix.base.i18n import language
 from pretix.base.invoicing.transmission import get_transmission_types
+from pretix.base.media import MEDIA_TYPES
 from pretix.base.models import (
     CachedFile, Checkin, Customer, Device, GiftCard, Invoice, InvoiceAddress,
     InvoiceLine, Item, ItemVariation, Order, OrderPosition, Question,
@@ -381,6 +382,7 @@ class PrintLogSerializer(serializers.ModelSerializer):
 class FailedCheckinSerializer(I18nAwareModelSerializer):
     error_reason = serializers.ChoiceField(choices=Checkin.REASONS, required=True, allow_null=False)
     raw_barcode = serializers.CharField(required=True, allow_null=False)
+    raw_source_type = serializers.ChoiceField(choices=[(k, v) for k, v in MEDIA_TYPES.items()], default='barcode')
     position = serializers.PrimaryKeyRelatedField(queryset=OrderPosition.all.none(), required=False, allow_null=True)
     raw_item = serializers.PrimaryKeyRelatedField(queryset=Item.objects.none(), required=False, allow_null=True)
     raw_variation = serializers.PrimaryKeyRelatedField(queryset=ItemVariation.objects.none(), required=False, allow_null=True)
@@ -390,7 +392,7 @@ class FailedCheckinSerializer(I18nAwareModelSerializer):
     class Meta:
         model = Checkin
         fields = ('error_reason', 'error_explanation', 'raw_barcode', 'raw_item', 'raw_variation',
-                  'raw_subevent', 'nonce', 'datetime', 'type', 'position')
+                  'raw_subevent', 'raw_source_type', 'nonce', 'datetime', 'type', 'position')
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
diff --git a/src/tests/api/test_checkin.py b/src/tests/api/test_checkin.py
index 6117f0dcb2..25e270d4ab 100644
--- a/src/tests/api/test_checkin.py
+++ b/src/tests/api/test_checkin.py
@@ -1127,6 +1127,7 @@ def test_store_failed(token_client, organizer, clist, event, order):
         organizer.slug, event.slug, clist.pk,
     ), {
         'raw_barcode': '123456',
+        'raw_source_type': 'nfc_uid',
         'nonce': '4321',
         'error_reason': 'invalid'
     }, format='json')