fix POST method bug

fire/endpoint.go

@@ -205,7 +205,7 @@ func (ep *EndPoint) Post(ctx context.Context) (createdDoc map[string]interface{}
 		}
 
 		for _, ref := range refs {
-			if err := tx.Create(ref, ep.Payload); err != nil {
+			if err := tx.Create(ref, ep.Payload.data); err != nil {
 				return err
 			}
 			refLog := ref.Collection("logs").NewDoc()