gristlabs_grist-core/app/server/lib/IBilling.ts

import * as express from 'express';

export interface IBilling {
  addEndpoints(app: express.Express): void;
  addEventHandlers(): void;
  addWebhooks(app: express.Express): void;
  addMiddleware?(app: express.Express): Promise<void>;
  addPages(app: express.Express, middleware: express.RequestHandler[]): void;
}