ruby on rails - Insert payment parameters into table after PayPal payment -

i use paypal-sdk-rest gem. have next def inside of feed.rb(model):

def self.paypal_url(return_path)   values = {     business: "team@team.com",     cmd: "_xclick",     upload: 1,     return: "#{rails.application.secrets.app_host}#{return_path}",     #invoice: id,     amount: 0.01,     item_name: "9dt9",     #item_number: course.id,     quantity: '1',     notify_url: "#{rails.application.secrets.app_host}/hook"   }   #"#{rails.application.secrets.paypal_host}/cgi-bin/webscr?" + values.to_query   "https://www.paypal.com/cgi-bin/webscr?" + values.to_query end 

inside of view file did put:

<%= link_to "checkout", @feed.paypal_url("http://my_website.com/en") %> 

for notify_url did use next function in feed_controller:

def hook   params.permit! # permit paypal input params   #status = params[:payment_status]   status = params[:st]   if status == "completed"     transaction.create(:status => params[:st], :transaction_id => params[:tx], :purchased_at => time.now)     puts "data: #{params[:st]} :: #{params[:tx]}"   else     puts "nothinghere"   end   render nothing: true end 

so, must add parameters table, doesn't. problem, knows? why doesn't insert table?

who can me it?

update

in mginx log get:

parameters: {"tx"=>"9bk361abcdefg473m", "st"=>"completed", "amt"=>"0.01", "cc"=>"usd", "cm"=>"", "item_number"=>"", "locale"=>"en"}