With IPN you session won't be available in the post back. The easiest solution would be to store them comma-separated and pass them to paypal in the "custom" field. Then you can retrieve them from that field to update the database.
With IPN you session won't be available in the post back. The easiest solution would be to store them comma-separated and pass them to paypal in the "custom" field. Then you can retrieve them from that field to update the database.
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