I would like to connect one Razorpay Payment API with WordPress, API has authentication token using username and password.
is there any builtin functionality available in WordPress to make a call and handle response?
you can use wp_remote_get()
for example
wp_remote_get( 'http://www.example.com/index.php?action=foo', array( 'timeout' => 120, 'httpversion' => '1.1' ) );
you can also control all request parameters like headers and body data.
Default Usage
global $wp_version;
$args = array(
'timeout' => 5,
'redirection' => 5,
'httpversion' => '1.0',
'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url(),
'blocking' => true,
'headers' => array(),
'cookies' => array(),
'body' => null,
'compress' => false,
'decompress' => true,
'sslverify' => true,
'stream' => false,
'filename' => null
);
Reference : More info