To download the images we used to order them in Sentinel Hub and then download in QGis. Is it still the same procedure? Is there any other way to make the download in one step?

We recommend you use subscriptions - this allow you to register your area of interest only once, then the data will be automatically updated in Sentinel Hub, throughout the time of the subscription.

You can then simply download to QGIS.

Planet images used to have some movement and we had to correct it many times. Do you know if they have improved this?

The new PSScene has improved in this regards, but the shifts are still visible on some occassions.

Planet images have been harmonized with Sentinel 2 since March 2022. Do you know if older images have been harmonized too?

Yes.

Thank you for your help! Is very usefull