Hello
@RobertS - welcome to the Forum.
No worries actually it is a very common practice on the Camino. I remember coming out of Burgos I questioned one Albergue if there are beds available and got a response something to the fact of "Just make sure you will be there". I panicked and replied back that I will be more than happy to give him my CC "
NOW" to which the man responded with
no Need; take it easy; have a nice walk and enjoy your Camino. The bed was indeed there when I came into town.
My suggestion is to download WhatsApp (if yoou have not done so already) as most of communications are done through it. Then the night before you may want to message the place with confirmation of your arrival "tomorrow" and perhaps an approximate ETA. Then on the day of the walk if you see that you are running late - message again with adjusted ETA. Easy, peasy, breezy!
Good luck and Buen Camino!