add payment type api

core/apps/finance/serializers/payment_type.py

@@ -0,0 +1,12 @@
+from rest_framework import serializers
+
+from core.apps.finance.models import PaymentType
+
+
+class PaymentTypeSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = PaymentType
+        fields = [
+            'id', 'name'
+        ]
+