MemberPress: Add An Email Parameter That Displays A Link To The Sub-Account Signup Page

function mepr_subaccount_email_parameter( $params, $txn ) {

  global $wpdb;

  $user = $txn->user();

  $caid = get_user_meta( $user->ID, 'mpca_corporate_account_id', true );

  if(empty( $caid ) ) {

    $query = $wpdb->prepare( "SELECT uuid FROM

{$wpdb->prefix}mepr_corporate_accounts WHERE user_id = %d",

      (int)$user->ID );

    $uuid = $wpdb->get_var( $query );

    if( isset( $uuid ) ) {

      $params['subaccount_link'] =  "https://cool-domain.com/register/organizational-membership-not-for-profit/?ca=$uuid"; //replace https://cool-domain.com/register/organizational-membership-not-for-profit/ with corporate account register link

    }

  }

  return $params;

}

add_filter('mepr_transaction_email_params', 'mepr_subaccount_email_parameter', 10, 2 );