cPanel/WHM API Shouldn't be Case Sensitive
As a cPanel administrator, I find it cumbersome to have to worry about the casing of my API parameters when dealing with various API endpoints. Some parameters are specified in lower case, and others are specified in all upper case. This requires referring to the API documentation to determine which is correct for that particular call.
The API shouldn't care about casing in parameters.
The whmapi1 modifyacct module is a good example of this: https://documentation.cpanel.net/display/SDK/WHM+API+1+Functions+-+modifyacct