Add payment in invoice admin as stacked inline

coin/billing/admin.py

@@ -8,10 +8,13 @@ class InvoiceDetailInline(admin.StackedInline):
     extra = 0
 
 
+class PaymentInline(admin.StackedInline):
+    model = Payment
+    extra = 0
+
+
 class InvoiceAdmin(admin.ModelAdmin):
-    inlines = [InvoiceDetailInline]
+    inlines = [InvoiceDetailInline, PaymentInline]
 
 
-admin.site.register(Invoice,InvoiceAdmin)
-admin.site.register(InvoiceDetail,)
-admin.site.register(Payment,)
+admin.site.register(Invoice,InvoiceAdmin)