Test whether data is sent only once to avoid data duplication
| purchDate |
|---|
| 2019-01-17 14:01:30 |
| 2018-12-31 22:43:23 |
| 2018-12-15 17:27:01 |
| 2018-11-15 15:45:30 |
| 2018-10-15 21:01:59 |
| 2018-09-28 20:55:58 |
| 2018-09-17 15:56:04 |
| 2018-09-02 16:40:21 |
| 2018-08-17 16:30:21 |
| 2018-07-24 21:51:07 |