I know this has been addressed a few times. But want to post for clarification and understanding.
Reward_data json has format of
"antiradpills_0": {
"shortname": "antiradpills",
"customIcon": null,
"amount": 1,
"skinId": 0,
"isBp": false,
"category": 7,
"displayName": "Anti-Radiation Pills",
"cost": 1,
"cooldown": 0

ICC has a format of

"antiradpills_0": {
"displayName": "Anti-Radiation Pills",
"cost": 1,
"cooldown": 0,
"shortname": "antiradpills",
"customIcon": null,
"amount": 1,
"skinId": 0,
"isBp": false,
"category": 7

How do I get these to match up, when overwritting and importing it does not work.

Check your JSON format for errors  -->  https://jsonlint.com/

There is no errors I usually edit with https://jsoneditoronline.org. works fine
But when I went to run it with modified ICC format it did not recongnize format

Just the difference in the order will not affect your use of it...

Merged post

You can replace lines 259 through 270 in the.cs file with this

        private class RewardData
        {
            public string shortname;
            public string customIcon;
            public int amount;
            public ulong skinId;
            public bool isBp;
            public Category category;
            public string displayName;
            public int cost;
            public int cooldown;
        }​

That worked, biggest problem I had is origional  also had an "items" that I missed as well on the reward_data json.
Loaded fine once edited everything, saved tons of time. Thank you