/**
 * Remove cancel button ( When last payment was less then 3 months ago )
 *
 * @param array $actions, action array.
 * @param int $subscription_id, the id of the current subscription.
 * @return array $actions, the altered action array.
 */
function remove_cancel_button( $actions, $subscription_id ) {

  // Gets the subscription object on subscription id
  $subscription = new WC_Subscription( $subscription_id );

  // Get last payment date from subscription object, uses the sites timezone setting
  $last_payment_date = $subscription->get_date( 'last_payment', 'site' );
  $last_payment_date = new DateTime( $last_payment_date );

  // The current date/time, uses the sites timezone setting
  $today = new DateTime( current_time('mysql') );

  // Get the difference in date
  $interval = $today->diff( $last_payment_date );

  // Check if interval is less then 3 months
  if( $interval->m < 3 ){
    unset( $actions['cancel'] );
  }

  // Return the actions
  return $actions;
}
add_filter( 'wcs_view_subscription_actions', 'remove_cancel_button', 100, 2);