PayPal Express Checkout with multiple items with active merchant in rails - ruby-on-rails

Question

I am trying to use PayPal ExpressCheckout button with multiple items but with no success.I am using NetBeans IDE, rails 4 and MySQL db.Here is what I did so far:
In my production.rb file I have:
Rails.application.configure do
config/application.rb.
config.after_initialize do
ActiveMerchant::Billing::Base.mode = :test
paypal_options = {
:login => "xxxx",
:password => "xxxx ",
:signature => "xxxx "
}
::STANDARD_GATEWAY = ActiveMerchant::Billing::PaypalGateway.new(paypal_options)
::EXPRESS_GATEWAY = ActiveMerchant::Billing::PaypalExpressGateway.new(paypal_options)
end
In my transaction.rb model I have:
def valid_purchase
if express_token.blank?
standard_purchase
else
express_token
end
def express_purchase
# price_in_cents = total
response = EXPRESS_GATEWAY.purchase(total, express_purchase_options)
if response.success?
self.status = "processed"
else
errors.add(:transactions, "---- #{response.message}.")
end
end
def express_token=(token)
self[:express_token] = token
if new_record? && !token.blank?
details = EXPRESS_GATEWAY.details_for(token)
self.express_payer_id = details.payer_id
self.ship_to_first_name = details.params["first_name"]
self.ship_to_last_name = details.params["last_name"]
end
end
private
def express_purchase_options
{
:ip => customer_ip,
:token => express_token,
:payer_id => express_payer_id
}
end
And in my transaction_controller.rb I have:
def express_checkout
order_items =[]
postage_rate=nil
item = Hash.new
#order = Order.find(session[:order_id])
#receipts = Receipt.where(:order_id=>#order.id)
#receipts.each do |r|
postage_rate = r.postage_rate * 100
end
#cart = Cart.find(#order.cart_id)
#cart.cart_items.each do |i|
#product = Product.find(i.product_id)
item = {
name: #product.product_name,
quantity: i.amount,
description: "ORDER_ID: #{#order.id}",
amount: #product.selling_price * 100 ,
shipping: postage_rate/#cart.cart_items.size
}
order_items << item
end
price_in_cents = (#order.total_p_pr * 100).round(2)
options = {
:ip => request.remote_ip,
:return_url => url_for(:action=>:new, :only_path => false),
:cancel_return_url => catalogs_traders_url,
:currency => "USD",
:allow_guest_checkout=> true,
:items => order_items # this line outputs: [{:name=>"owl potty", :quantity=>1, :description=>"ORDER_ID: 249", :amount=>2808.0, :shipping=>332.0}, {:name=>"a bag", :quantity=>1, :description=>"ORDER_ID: 249", :amount=>1260.0, :shipping=>332.0}, {:name=>"bracelet", :quantity=>1, :description=>"ORDER_ID: 249", :amount=>120.0, :shipping=>332.0}, {:name=>"beautiful woman", :quantity=>1, :description=>"ORDER_ID: 249", :amount=>74352.0, :shipping=>332.0}]
}
#passing the cost of the order
response = EXPRESS_GATEWAY.setup_purchase(price_in_cents,options )
redirect_to EXPRESS_GATEWAY.redirect_url_for(response.token)
end
def new
#transaction = Transaction.new(:express_token => params[:token])
end
I get:
Any help will be more than welcome. Thank you!

Answer 1

I red this post very,very carefully
setting tax amount in Active Merchant / PayPal Express Checkout
and I understood my mistakes. Here is my corrected transaction_controller:
# to redirect to PayPay site
def express_checkout
pr = nil
tp = nil
items =[]
postage_r=[]
total_p = []
order_items =[]
postage_rate=nil
item = Hash.new
#order = Order.find(session[:order_id])
#receipts = Receipt.where(:order_id=>#order.id)
#receipts.each do |r|
total_p << r.total_price
postage_r << r.postage_rate
end
tp = total_p.inject{|sum,x| sum + x }
pr = postage_r.inject{|sum,x| sum + x }
#cart = Cart.find(#order.cart_id)
#cart.cart_items.each do |i|
#product = Product.find(i.product_id)
item = {
name: #product.product_name,
quantity: i.amount,
description: "ORDER_ID: #{#order.id}",
amount: #product.selling_price * 100 ,
}
order_items << item
end
price_in_cents = (#order.total_p_pr * 100).round(2)
options = {
:subtotal => tp * 100,
:shipping => pr * 100,
:handling => 0,
:tax => 0,
:ip => request.remote_ip,
:return_url => url_for(:action=>:new, :only_path => false),
:cancel_return_url => catalogs_traders_url,
:currency => "USD",
:allow_guest_checkout=> true,
:items => order_items
}
#passing the cost of the order
response = EXPRESS_GATEWAY.setup_purchase(price_in_cents,options )
redirect_to EXPRESS_GATEWAY.redirect_url_for(response.token)
end
It worked. I hope my post will be useful for someone who want to integrate Express Checkout button. Thank you for all your help!