Basic Plaid Integration (#1433)

* Basic plaid data model and linking

* Remove institutions, add plaid items

* Improve schema and Plaid provider

* Add webhook verification sketch

* Webhook verification

* Item accounts and balances sync setup

* Provide test encryption keys

* Fix test

* Only provide encryption keys in prod

* Try defining keys in test env

* Consolidate account sync logic

* Add back plaid account initialization

* Plaid transaction sync

* Sync UI overhaul for Plaid

* Add liability and investment syncing

* Handle investment webhooks and process current day holdings

* Remove logs

* Remove "all" period select for performance

* fix amount calc

* Remove todo comment

* Coming soon for investment historical data

* Document Plaid configuration

* Listen for holding updates

app/controllers/webhooks_controller.rb

@@ -1,7 +1,19 @@
 class WebhooksController < ApplicationController
-  skip_before_action :verify_authenticity_token, only: [ :stripe ]
+  skip_before_action :verify_authenticity_token
   skip_authentication
 
+  def plaid
+    webhook_body = request.body.read
+    plaid_verification_header = request.headers["Plaid-Verification"]
+
+    Provider::Plaid.validate_webhook!(plaid_verification_header, webhook_body)
+    Provider::Plaid.process_webhook(webhook_body)
+
+    render json: { received: true }, status: :ok
+  rescue => error
+    render json: { error: "Invalid webhook: #{error.message}" }, status: :bad_request
+  end
+
   def stripe
     webhook_body = request.body.read
     sig_header = request.env["HTTP_STRIPE_SIGNATURE"]