Option 1: Members text a word or code to a number and an auto response comes back to a link where they can give online: ‘GIVEChurchname’ to 83434 (or 888-777-6543).

However, this is not truly text-to-give because the entire process needs to be done for each donation.

Option 2: A preferred method is to use an app that allows a one-time setup process (personal details, credit card info, etc.). After that, your members just log in, text their amount, and done. There are many great vendors who focused on this. 

Find more information in this blog.