Turkish Identification Number Validation in JSON Format

import groovy.json.JsonSlurper

// Create a parser for processing JSON data
def parser = new groovy.json.JsonSlurper()

// Parse the incoming JSON data
def jsonResp = parser.parseText(requestBodyTextFromClient)

// Extract Turkish Identification Numbers from the received JSON
def requestingUserIdentityCardNo = jsonResp.requestingUserIdentityCardNo
def requestedIdentityCardNo = jsonResp.requestedIdentityCardNo

// Method to validate the Turkish Identification Number
def validateTCKN(variableToCheck) {
    // Check the length and validity of the Turkish Identification Number
    if (!variableToCheck || variableToCheck.length() != 11) {
        requestErrorMessageToTargetAPI = 'Please send a valid parameter: ' + variableToCheck + '.'
    } else {
        // Validate the Turkish Identification Number mathematically
        def tcArr = variableToCheck.substring(0, 11).split('')
        def odd = tcArr[0].toInteger() + tcArr[2].toInteger() + tcArr[4].toInteger() + tcArr[6].toInteger() + tcArr[8].toInteger()
        def even = tcArr[1].toInteger() + tcArr[3].toInteger() + tcArr[5].toInteger() + tcArr[7].toInteger()
        odd = odd * 7
        def result = odd - even

        // Create an error message in case of validation errors
        if (result % 10 != tcArr[9].toInteger()) {
            requestErrorMessageToTargetAPI = 'Please send a valid parameter: ' + variableToCheck + '.'
        }

        def tcTotal = 0
        for (int i = 0; i < 10; i++) {
            tcTotal += tcArr[i].toInteger()
        }

        // Create an error message in case of validation errors
        if (tcTotal % 10 != tcArr[10].toInteger()) {
            requestErrorMessageToTargetAPI = 'Please send a valid parameter: ' + variableToCheck + '.'
        }
    }
}

// Validate both Turkish Identification Numbers
validateTCKN(requestingUserIdentityCardNo)
validateTCKN(requestedIdentityCardNo)

#Sample Request:
{"requestingUserIdentityCardNo": 11111111110, "requestedIdentityCardNo":11111111112 }