I have a program that needs to send alert notifications. Basically I want that the user using the program should get notifications. The program developer should not be involved.
For example: I have written a program that does a certain task and based on conditions alert notifications should go to the customer (person using it). Now I do not want to use Whatsapp Api or create my mobile app or anything as I do not want to be the middleman. Basically the program and the customer should be involved.
Thus is there a service or app that allows user to register and user can share token/id etc and program can sent alert to user. This way me/my firm is not in the picture. Telegram bots is not possible as I have to own telegram a/c. In a nutshell alert notifications are not routed through me/my server or account but rather than through user.
Thank you