I had a quick question about passing parameters from one site to another - without an API / developer link with the third party website.

Eg: In simplistic terms -> User inputs their requirements on Site A -> Site A then queries the database on Site B with the data required -> Pass this back to Site A and carry on the interaction.

In real life -> User searches for tickets on Site A -> Site A asks this information from Site B (there is no existing relationship / API / datafeed of any sorts) -> Site B returns the availability of tickets to Site A -> User then selects the tickets, seats , show etc and then makes the payment to Site B based on the information collected from the user.

I just want to know if this is achievable?

To make matters worse -> Site B can (depending on the implementation) use SSL as well!

Thanks in advance and Kind Regards,