Please read the title of the forum. This forum is ONLY for questions/issues relating to Sql Developer.
How does ANY of what you posted relate to Sql Developer? It doesn't appear it even relates to Oracle
I have been told:
The code behind the program will need to be modified to a secure the username & password. In addition the program needs to dynamically call app credential and encrypt
Encrypt what? You can't provide encrypted passwords to Oracle.
Is there any other method to fulfill this requirement?
Yes - you already rejected it
4. Have user enter username and password - not acceptable
I suggest you post your question/issue in an Excel or VBA forum.