Pricing based on number of characters input
Hello everyone,
I am developing an e-commerce site using commerce kickstart 7.x for a Trophies and medals selling shop. They have kind of a different requirement. They want their product to be priced based on the number of characters inputted by the user for engraving. For eg, For the first 40 characters, there wont me no extra charge and from the 41st character, user will be charged 50 cents per character. How can I achieve this in commerce kickstart?
I tried product pricing rule but didn't know how to write condition to count the input characters and to add 50 cents from 41st character?
If I have to programme it, can anyone please guide me how to do that?
Thanks in advance.