How can I sell this?

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Hi /biz/. In the last few weeks I wrote 365 days program. I want to teach people Meditation. I'll sell the program for $0,99/month (for a year). I want to make a 1 year 100% money back if people aren't satisfied.
>Big Problem: I want to send them day by day program for a year by email, and i want to be done in automatic (i don't want to spend every day to send singularly each email).
>How can I do this? (Woocommerce oe Shopify)