I have some codes to share, and as for use:
1. Log into the Mogstation (Search online if you need to)
2. Click "Manage Service Options"
3. Click "Enter Recruitment Code" and enter the code before your first payment for a month.

The codes are as follows:
1. EC9V6XD7

2. CEM3HDQS

3. ABBQKAPT

If any of these don't work, you already have made your first month of payment or the code that doesn't work has been used already. Sorry about if the second case happens.