Hello, in Portugal there are freeways that are paid with card in toll booths almost all of them automatically, or with cash.
But there are others that the payment is only done by cameras and previously you had to register on their website or register the license plate at a toll booth at the entrance. I doubt that you would have a problem being a foreigner and from so far away, but I am telling you just in case.
From Spain there are not these posts in all the borders, only in some, which forces you to register by internet if or yes, things of Portugal.....
Last time I decided to avoid them and go by non-toll roads, you see more places and do more tourism.
Do some research on the internet or avoid tolls, you have no other solution. If you are near the Caramulo Museum and have time to spare, it is an interesting museum.
If you are not close I don't think it's worth the trip.
From Spain you can check the message that I put a few minutes ago to another colleague of interesting places to visit, of course there are many more, but it can be a good route.
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From France, I would recommend you if you are still there in early July to be in Le Mans Classic, you are also in the Loire Valley area and its castles.
Be careful in Spain and France there are more and more radars, I recommend installing the Waze app that reports traffic, radars and all kinds of incidents.
In France, the toll booths are too high for my
R172 and in some of them I had to get out of the car to be able to pay by card, even if I didn't get too close for fear of scratching it.
Since two years ago, every time I go to Le Mans Classic or any other event I go to, I carry a lot of money in coins and I pay in coins in a basket, it tells you the amount, you look for it and you throw it as if you were playing basketball. I find it almost more comfortable, I don't consider the electronic tolls, I prefer cash for everything I can and more and more, but that's another topic that has nothing to do with this thread.
Have a nice trip!