Is it possible to import coupon codes?

You can add coupons in your WordPress Dashboard one-by-one, or you can import them if you'd like. However, at this time, there is no UI for coupon code importation. Until we add this in, see short-term workaround.

To Add Coupons via the Dashboard

See: WordPress Dashboard → s2Member → Pro Coupon Codes

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To Import Coupon Codes via Import File

1. Create this directory and file:

/wp-content/mu-plugins/s2-new-coupons.php

<?php
add_action('init', function(){
  if(empty($_GET['s2_new_coupons']) || $_GET['s2_new_coupons'] !== '[secret key]')
    return; // Not a coupon addition request, or not a valid key.

  if(!is_file(ABSPATH.'s2-new-coupons.txt'))
    return; // Coupon file does not exist.

  $new_coupons = trim(file_get_contents(ABSPATH.'s2-new-coupons.txt'));
  $GLOBALS['WS_PLUGIN__']['s2member']['o']['pro_coupon_codes'] .= "\n".$new_coupons;
  update_option('ws_plugin__s2member_options', $GLOBALS['WS_PLUGIN__']['s2member']['o']);
  exit('New coupons added successfully!');
});

2. Change [secret key]

In the above code, change [secret key] to a random password that only you know.

3. Create a file containing your new coupon codes.

Format (one per line):

code|discount|start(YYYY-MM-DD)~end(YYYY-MM-DD)|directive|singulars|users|max-uses

For additional details on each of these fields, see: WordPress Dashboard → s2Member → Pro Coupon Codes

Example file: /s2-new-coupons.txt

SAVE5PERCENT|5%
SAVE10|10
CHRISTMAS2015|25%|2015-12-01~2016-01-01
JULY4TH|40%|2015-07-04~2015-07-05|ta-only|1||1000
SAVE20|20|~2015-10-03|ta-only|||1000

4. Upload /s2-new-coupons.txt

Upload /s2-new-coupons.txt via FTP, to the root of your WordPress installation; i.e., in the same directory as /wp-config.php. Once you're done with the next step, you can remove this file. It is only needed for the import. After that, you can delete it if you'd like.

5. Access this URL in your browser to do the import.

http://yoursite.com/?s2_new_coupons=[secret key]

You should see a message that reads:

New coupons added successfully!

Check your Dashboard to confirm the import worked as expected.