[OPPS-339] Flexcharge: Token validation issue solved

[jherreraa]

Summary:

This PR includes type conversion on token value to avoid application error.

Test Execution:

Unit test

Finished in 0.018741 seconds. 28 tests, 125 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications 100% passed 1494.05 tests/s, 6669.87 assertions/s

Remote test

Finished in 47.854133 seconds. 22 tests, 66 assertions, 5 failures, 0 errors, 0 pendings, 1 omissions, 0 notifications 76.1905% passed 0.46 tests/s, 1.38 assertions/s

Failures not related to change

RuboCop: 808 files inspected, no offenses detected