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// Adding items to your invoice is very basic, the parameters 
// expected are name_of_item, quantity, unit_price, total_price and 
// optional item description.
invoice.addItem("13' Apple Retina 500 HDD",1,10.99,10.99);
invoice.addItem("Case Logic laptop Bag",2,100.50,201,"Optional description");
invoice.addItem("Philips electric shaver",2,50.50,101.00);

/* You can optionally set a generation invoice description text which can 
be used in cases where your invoice does not need an items list or in cases
where you need to include some extra descriptive information to your invoice */

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MPowerCheckoutStore store = new MPowerCheckoutStore();
store.setName("My Awesome Online store");
store.setTagline("This is an awesome Java store setup.");
store.setPhoneNumber("024000001");
store.setPostalAddress("606 Memorylane Chokor no.1 Road.");
store.setWebsiteUrl("http://my-awesome-long-website-url.com/");

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MPowerSetup setup = new MPowerSetup();
setup.setMasterKey("dd6f2c90-f075-012f-5b69-00155d846600");
setup.setPrivateKey("test_private_oDLVld1eNyh0IsetdhdJvcl0ygA");
setup.setPublicKey("test_public_zzF3ywvX9DE-dSDNhUqKoaTI4wc");
setup.setToken("ca03737cf94wcf644f36"); 
setup.setMode("test");

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import com.mpowerpayments.mpower.*;

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# Get the token prameter from the QUERYSTRING if you are on Rails or Sinatra
token = params[:token]

invoice = MPower::Checkout::Invoice.new
if invoice.confirm(token)

  # Retrieving Invoice Status
  # Status can be either completed, pending, canceled, fail
  puts invoice.status

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# Globally setting return URL, the piece of code below 
# should be included with the checkout shop setup code
MPower::Checkout::Store.return_url = "http://www.myawesomeshop.com/"

# Setting the return URL on an invoice instance. 
# This will overwrite any global settings for return URL
invoice.return_url = "http://www.myawesomeshop.com/"

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# Globally setting cancel URL, the piece of code below 
# should be included with the checkout shop setup code
MPower::Checkout::Store.cancel_url = "http://www.myawesomeshop.com/"

# Setting the cancel URL on an invoice instance. 
# This will overwrite any global settings for cancel URL
invoice.cancel_url = "http://www.myawesomeshop.com/"

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# Custom data allows you to add extra data to the invoice information 
# which can be accessed via our confirm API callback
invoice.add_custom_data("Firstname","Alswell")
invoice.add_custom_data("Lastname","Cobbinah")
invoice.add_custom_data("CartId",450021)
invoice.add_custom_data("Plan","JUMBO")

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# The parameters for setting add tax are title_of_the_tax, tax_amount
invoice.add_tax("VAT (15%)",30);
invoice.add_tax("NHIL (5%)",10);

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# The code below depicts how to create the checkout invoice on our servers
# and redirect to the checkout page.
if invoice.create
  puts invoice.status
  puts invoice.response_text
  # you may want to do "redirect_to invoice.invoice_url" in a Rails controller
  puts invoice.invoice_url
else
  puts invoice.status
  puts invoice.response_text