title: How to pay for something using my phone/sim credit?
body: <p>I am developing an iPhone application(<code>Swift 2.0</code>) which targets Metro bus system. It will help a person to pay for ticket using two ways:</p>
  
  <ol>
  <li>bank account</li>
  <li>Phone credit i.e the phone credit of the user will be deducted every
  time he pays for the ticket using his phone credit.</li>
  </ol>
  
  <p>Now, I am not sure how to achieve <strong>#2</strong>. How can I make the user pay for the ticket using his phone credit. </p>
  
  <p>I am new here, so I am sorry for any ambiguities in my question. I hope you understand what I want to ask. </p>
  
  <p>I need ideas and clear explanations from you to achieve <strong>#2</strong>. </p>
  
  <p>Thanks in advance for your answers.  </p>