You can automate your website for data and vtu purchase using sim hosting service. It has a simple api for integration.
example. This service enable your sim to share data or process vtu by Dialing the required USSD Code or Sending SMS to network provider.

MTN DataShare

SMEC 08060000000 1000 1234 TO 131

https://simhostng.com/api/smsx?apikey=123344&server=234444&number=131&message=SMEC 08060000000 1000 1234 TO 131

E.g. MTN USSD VTU

*456*1*2*100*08060000000*1*1234#

GLO VTU USSD CODE
*202*2*0850000000*100*1234*1#

GLO DATA USSD CODE
*127*53*07052232029#


SENDING SMS
https://simhostng.com/api/sms

Post Parameters:
apikey: API key
server: Server Id
network: network
number: Recipient Separate Multiple number with comma
message: Message: Text Message
ref: Unique Reference number (if empty the system will generate one for you)
url: Response Callback URL


SPC BULK SMS COMPONENTS

https://simhostng.com/api/bulksms?apikey=apikey&server=serverid&number=@@recipient@@&message=@@message@@

Response= Ok


USSD POST

https://simhostng.com/api/ussd

Post Parameters:

apikey: API key
server: Server Id
network: Network
number: ussd to dial *555#
ref: Unique Reference number (if empty the system will generate one for you)
url: Response Callback URL


INBOX FORWARDING

We post back received sms to your script using default url used during server setup
sim = The number that received the message (to, recipient)
keyword = Message keyword
sender = The number that sent the message (from, phone)
message = Text message
ref: Reference number
date = Date

Below is a simple php code to receive the sms reply from your sim or keyword.

http://demo.com/recieve.php

<?php
$keyword= $_POST['keyword'];
$server= $_POST['server'];
$sim= $_POST['sim];
$sender= $_POST['sender'];
$message= $_POST['message'];
$ref = $_POST['ref'];

$date= $_POST['date'];
?>


RESPONSE PUSH / CALLBACK
Parameters:

response: Response For ussd or sms
ref: Your Reference


Below is a simple php code to receive the response from your sim after ussd or sms.
http://demo.com/response.php
<?php
$ref= $_POST['ref'];
$response= $_POST['response];
?>

Thank you