Hello, I'm trying to integrate paypal express checkout's and i've managed to be able to set the flat-rate and update the delivery costs after i, as a customer, update my delivery address. But my "NO_SHIPPING_OPTION_DETAILS" response seems to be ignored by paypal. I've checked on stackoverflow, https://stackoverflow.com/questions/17047119/paypal-callback-api-no-shipping-option-details-ignored?rq=1 this didn't work for me. I've the exact same response this user has and still paypal uses the flat-rate instead. I'm not sure what is wrong or how can i proceed. I've also tried to set all required fields with "standard" text and amounts. And i've tried to set callback version to `61` and `61.0` but no luck. Help would be much appreciated. Regards, Luis
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