Single database for multiple shops

Use ActsAsTenant as Multi-tenancy for shops

See below files:
- app/controllers/concern/multi_tenancy.rb
- app/models/application_record.rb
- app/models/shop.rb

An initializer can be created to control option in ActsAsTenant.
config/initializers/acts_as_tenant.rb
require 'acts_as_tenant/sidekiq'
ActsAsTenant.configure do |config|
  config.require_tenant = false # true
end

more details: https://github.com/ErwinM/acts_as_tenant

app/controllers/api/payment/mobilepayment_controller.rb

@@ -14,7 +14,7 @@ class Api::Payment::MobilepaymentController < Api::ApiController
 
       saleObj = Sale.find(sale_id)
       sale_items = SaleItem.get_all_sale_items(sale_id)
-      shop_detail =  Shop.first
+      shop_detail =  Shop.current_shop
 
       # rounding adjustment
       if !path.include? ("credit_payment")