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# Onsite Payment Request requires the mpower customer account alias as the parameter
if invoice.create("MPOWER_CUSTOMER_USERNAME_OR_PHONENO")
  puts invoice.status
  puts invoice.response_text
  puts invoice.token
else
  puts invoice.status
  puts invoice.response_text
end

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# If you wish to accept payments directly on your service
invoice = MPower::Onsite::Invoice.new

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# If you intend to use a simpler approach by redirecting to the MPower checkout page
invoice = MPower::Checkout::Invoice.new

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// Invoice token is returned as a URL query string "token"
// You are free to also explicitly check the status of an invoice
String invoiceToken = "sjklsdll21-ms0w";

MPowerCheckoutInvoice invoice = new MPowerCheckoutInvoice (setup, store);
if (invoice.confirm(invoiceToken)) {

  // Retrieving Invoice Status
  // Status can be either completed, pending, canceled, fail
  System.out.println(invoice.getStatus());

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// Globally setting return URL, the piece of code below 
// should be included with the checkout shop setup code
MPowerStore store = new MPowerStore()
store.setReturnlUrl("http://www.myawesomeshop.com/");

// Setting the return URL on an invoice instance. 
// This will overwrite any global settings for return URL
invoice.setReturnlUrl("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
MPowerStore store = new MPowerStore()
store.setCancelUrl("http://www.myawesomeshop.com/");

// Setting the cancel URL on an invoice instance. 
// This will overwrite any global settings for cancel URL
invoice.setCancelUrl("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.addCustomData("Firstname","Alswell");
invoice.addCustomData("Lastname","Cobbinah");
invoice.addCustomData("CartId",450021);
invoice.addCustomData("Plan","JUMBO");

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// The parameters for setting add tax are title_of_the_tax, tax_amount
invoice.addTax("VAT (15%)",30);
invoice.addTax("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()) {
  System.out.println(invoice.getStatus());
  System.out.println(invoice.getResponseText());
  System.out.println(invoice.getInvoiceUrl());
} else {
  System.out.println(invoice.getResponseText());
  System.out.println(invoice.getStatus());
}

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invoice.setTotalAmount(100.50);