price_finder_mailbox.rb

class ApplicationMailbox < ActionMailbox::Base
  routing ->(inbound_email) { with_sku?(inbound_email) } => :price_finder


  def self.with_sku?(inbound_email)
    inbound_email.mail.subject.include?('SKU') || inbound_email.mail.body.include?('SKU')
  end
end

class PriceFinderMailbox < ApplicationMailbox
  def process
    # Extract product_id and quantities
    # Call API to get the price of the product
    # total price = quantities * price
    # Draft email and send this price to sender via email.
    Quotation.with_price(mail.to.first).deliver_now
  end
end