Refactor data for sending

aleksis/apps/paweljong/frontend/components/event_registration/EventRegistrationForm.vue

@@ -736,12 +736,18 @@ import SecondaryActionButton from "aleksis.core/components/generic/buttons/Secon
       dataForSubmit() {
         const { confirmEmail, confirmPassword, ...filteredUserData } = this.data.user;
 
-        return {
+        const data = {
           ...this.data,
           additionalFields: JSON.stringify(this.data.additionalFields),
           terms: JSON.stringify(this.data.terms),
           user: filteredUserData,
         };
+
+        if (this.event.cost == 0 && this.event.maxCost == 0) {
+          const { payment, ...filteredData } = data;
+          return filteredData;
+        }
+        return data;
       },
       steps() {
         return [
@@ -831,7 +837,7 @@ import SecondaryActionButton from "aleksis.core/components/generic/buttons/Secon
           comment: "",
           additionalFields: {},
           terms: {},
-          retractionConsent: null,
+          retractionConsent: false,
         },
       };
     },