import json

res = {

}
with open('pay.json', 'r', encoding='utf8') as f:
    data = json.load(f)
    key2con = data['paycon']['default']['key2con']
    orange = data['paycon']['default']
    for key, p in key2con.items():
        res[key] = {
            "proid": key,
            "unitPrice": orange[p[1]][p[0]]['unitPrice'],
            "name": orange[p[1]][p[0]]['name'],
        }

with open('pay.json', 'w') as f:
    json.dump({
        'paycon': {'default': res}
    }, f)