If you have existing members in your membership and want to provide the facility for these users to upgrade their levels or packages, this can be done following the guide below:
For Paypal Buttons (Standard Paypal)
The best way to handle this would be to create a subscriber modification button. To do this, go to OptimizeMember > Paypal Buttons > Paypal Subscr Modification Buttons
From here you can generate a shortcode which will create an order button for a package upgrade
Once you have generated your order button code, this would need to be added to a page within your membership where your member is already logged in. This should also be possible with a normal paypal order form if you wish
For Paypal Pro-Forms
If you're using Paypal pro forms the option is located inside:
OptimizeMember > Paypal Pro-Forms > PayPal Pro Billing Modification Forms
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