I want to read the Android text message keyword.

I think I saw a similar question. To give you my idea, when I use a debit card, everyone says that they used a certain amount of money. I'd like to use this to create a diary application. I'd like to set the bank as a keyword, and if it's in the keyword range, I'd like to read the text and read the corresponding amount (number) and use the value in the application. I'd appreciate it if you could tell me the application, direction, and method ㅠ<