Thanks Diedre,
I'm not aware of indemnity forms here, but, I have been able to email documents recently.
When the person books a reservation, they automatically receive a response, in which they are directed to email me and once they do, I can send the requisite forms.
I have them fill out a mdeical history with emergency contacts, an explanation about the hike which they sign showing they know what they are getting into and what gear to bring, and, the indemnity form.
If they don't email me then I can't send the forms and I am risking getting a customer who can't actually do the hike or is doing so with a medical condition unknown to me.
It would be preferable to automate this step to make sure customers are providing this information for everyone's safety and to mitigate liability.