Update user meta after membership checkout

Use the below code in functions.php of your current theme to update user meta after membership checkout. The code is executed after successful membership checkout.

add_action("pmpro_after_checkout", "update_user_meta_after_upgrade", 10 ,1 );

function update_user_meta_after_upgrade( $user_id ){
    // Get level details 
    $membership_level_details   = pmpro_getMembershipLevelsForUser($user_id);
    $level_id           = $membership_level_details[0]->ID;
    
    update_user_meta($user_id,'your_metakey');
// perform action according to the level    
return;
    }