add_action( 'gform_after_submission_1', 'post_contact_info', 10, 2 );
function post_contact_info( $entry, $form ) {
    $user = 'xxxxx';
    $pass = 'uuuuu';
    $url = 'https://API.EposnowHQ.com/API/V2/Customer/';
    $headers = array(
        'Content-Type' => 'application/json',
        'Authorization' => 'Basic '. base64_encode("$user:$pass")
    );
    $contact_info = array(
        'Forename' => $entry['53'],
        'Surname' => $entry['55'],
        'ContactNumber' => $entry['5'],
        'EmailAddress' => $entry['4']
    );
    $body = json_encode( $contact_info );
    $args = array( 'headers' => $headers, 'body' => $body );
    $response = wp_remote_post( esc_url_raw( $url ), $args );
    $response_code = wp_remote_retrieve_response_code( $response );
    $response_body = wp_remote_retrieve_body( $response );
    $result = json_decode( $response_body );

$customer_id = $result['CustomerID'];

$address_info = array(
        'CustomerID' => $customer_id,
        'AddressLine1' => $entry['35'],
        'Town' => $entry['36'],
        'State' => $entry['38'],
        'PostCode' => $entry['39']
    );
        $url2 = 'https://API.EposnowHQ.com/API/V2/CustomerAddress/';
        $body2 = json_encode( $address_info );
        $args2 = array( 'headers' => $headers, 'body' => $body2 );
        $response2 = wp_remote_post( esc_url_raw( $url2 ), $args2 );
}