WordPress.org

1. Upload the 'subscriptions' folder to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress

3. Add tags to your post text:

   In any post where you want a subscription button add this tag:

   [ppsa]NAME|PRICE|FREQUENCY|PERIOD[/ppsa]

   This will create the subscription button. E.g. [ppsa]news|20|5|day[/ppsa] - this means 'bill me 20 dollars every 5 days for news'

   Acceptable period values: day, week, month, year

4. Test your registration form by clicking through from the subscription button

One thing to be aware of: I have included the main API credentials for testing direct payment. Add your own when testing Express Checkout.

Test data for the main API credentials:

Visa 4595258908900506 01/2010 Verification 962

All the other details can be what you like.

1. Enable SSL http://www.kerrins.co.uk/blog/admin-ssl/ (It's important to make sure wp-login.php and your WordPress URL in General Settings are both set to SSL)
2. Place your Paypal API credentials in WordPress Settings -> Paypal API Subscriptions
3. Optionally change the thank you message
4. It is recommended you test once again using SSL and real money (say 10, 20 cents)
5. Put up a WordPress Admin Theme to reflect your site so that the transition is seamless! http://codex.wordpress.org/Creating_Admin_Themes
6. Create as many subscription buttons as you want!