Webservice issues

[Guest]

Pulling what is left of my hair out here 

Webserice used to work fine with our courier system (Parcelforce) but has stopped. Courier system developers say there is nothing wrong at their end. To show this, the installed their own version of Prestashop and used the webservice to pull down orders into their system. The produced the attached csv file to show that it works

 

Now from my side. If I go to domain.com/api and enter the key  get access to the api. And if i use domain.com//api/orders?filter%5Bcurrent_state%5D=%5B20%5D&filter%5Bdate_add%5D=%3E%5B2019-05-20+22%3A00%3A00%5D&display=full&date=1&sendemail=1

I can see the full xml data as shown in screen print - so I KNOW the webservice works. and i KNOW the courier system works, but SOMETHING must be blocking the two from talking to each other

Ourr access logs show these lines when the courier tries to get the orders from the webservice (nothing in their logs)

78.153.247.199 - - [22/May/2019:22:01:44 +0100] "GET /api/orders?filter%5Breference%5D=00000000&display=full&sendemail=1 HTTP/1.1" 200 124 "-" "Zend_Http_Client"
78.153.247.199 - - [22/May/2019:22:01:52 +0100] "GET /api/orders?filter%5Bcurrent_state%5D=%5B20%5D&filter%5Bdate_add%5D=%3E%5B2019-05-20+22%3A00%3A00%5D&display=full&date=1&sendemail=1 HTTP/1.1" 200 3622 "-" "Zend_Http_Client"

 

And sometimes

78.153.247.199 - - [22/May/2019:13:02:41 +0100] "GET /api/order_states?display=%5Bid%2Cname%5D HTTP/1.1" 200 504 "-" "Zend_Http_Client"
78.153.247.199 - - [22/May/2019:13:02:41 +0100] "GET /api/orders?filter%5Bcurrent_state%5D=%5B1%7C2%7C3%7C8%7C9%7C10%7C11%7C12%7C13%7C14%7C18%7C19%7C20%5D&filter%5Bdate_add%5D=%3E%5B2019-05-02+22%3A00%3A00%5D&display=full&date=1&sendemail=1 HTTP/1.1" 200 3718 "-" "Zend_Http_Client"
 

Which shows they are trying to connect. I go to that link and I can see the data. So what on earth is happening . Is this a clue??

HTTP/1.1" 200 3622 "-" "Zend_Http_Client"

Not sure what 3622 (or the 506 and 3718) refers to

 

Phpinfo file if it helps: http://u-bolts-r-us.co.uk/phpinfo.php

Is there anyone who can help track down the issue?

WDMPATC_20190522_eorder_logs.csv