Techniques are described for generically providing a solution to developers in supporting web service input calls to systems with dynamic definitions. An example method includes obtaining, from a repository, a list of code value and code description pairs associated with the particular data type. The obtained list is searched for a particular code description matching the string value of the identified input. In response to identifying a particular code description exactly matching the string value of the identified input, the string value of the identified input is associated to the particular code value corresponding to the particular code description. The particular backend application is then executed based on the particular code value associated with the string value of the identified input.