<form name="" id="formID" action="https://portal.merchantservicedepot.com/apis/apple_subscription.php" method="post">
    <input type="text" name="username" value="msdusername"/>
    <input type="text" name="api_key" value="msdapikey"/>
    <input type="text" name="signature_token" value="{"identifyKey":"test","data":"test","ephemeralPublicKey":"test","publicKeyHash":"test","transactionId":"test","signature":"test","version":"EC_v1","displayName":"MasterCard 1111","network":"MasterCard","type":"credit"}"/>
    <input type="text" name="first_name" value="Roberto"/>
    <input type="text" name="last_name" value="Diaz"/>
    <input type="text" name="address" value="4446 Green Avenue, Suite 56"/>
    <input type="text" name="city" value="Los Angeles"/>
    <input type="text" name="state" value="CA"/>
    <input type="text" name="zip_code" value="94085"/>
    <input type="text" name="country_code" value="US, CN"/>
    <input type="text" name="email" value="[email protected]"/>
    <input type="text" name="memo" value="memoofthetransaction"/>
  <br/>
  <button type="button" id="applePay" onclick="callPayment()"></button> 
</form>
<script type="text/javascript" >
  function callPayment()
  {
    var app_key="b0cf87c7e314af8638ce34732f1f7d24";
    var business_name="Test shop";
    var plan_details='{"plan_id":XX,"plan_name":"Test plan","period_type":"WEEKLY","amount":"1.30","currency":"USD","no_of_charge":2}';

    msdApplePay.paymentRequestRecurring(app_key,business_name,plan_details,start_date);
  }

  msdApplePay.paymentResponse=function(responseStatus,responseText){
    if(responseStatus=="S")
    {
      document.getElementById('signature_token').value = responseText;
      document.getElementById("formID").submit();
    }else{
      alert(responseText);
    }
  }
</script>