Finish MFA v1 and refactor all tokens into separate TokenService with modified collection

backend/src/variables/index.ts

@@ -42,6 +42,15 @@ import {
 } from './action';
 import { SMTP_HOST_SENDGRID, SMTP_HOST_MAILGUN } from './smtp';
 import { PLAN_STARTER, PLAN_PRO } from './stripe';
+import {
+  MFA_METHOD_EMAIL
+} from './user';
+import {
+  TOKEN_EMAIL_CONFIRMATION,
+  TOKEN_EMAIL_MFA,
+  TOKEN_EMAIL_ORG_INVITATION,
+  TOKEN_EMAIL_PASSWORD_RESET
+} from './token';
 
 export {
   OWNER,
@@ -84,4 +93,9 @@ export {
   SMTP_HOST_MAILGUN,
   PLAN_STARTER,
   PLAN_PRO,
+  MFA_METHOD_EMAIL,
+  TOKEN_EMAIL_CONFIRMATION,
+  TOKEN_EMAIL_MFA,
+  TOKEN_EMAIL_ORG_INVITATION,
+  TOKEN_EMAIL_PASSWORD_RESET
 };