CloudFlare Blocking Vend Connecting to my site

Hi there,

We’ve got CloudFlare set up for domain peter-hall.co.uk.

We’re trying to get a 3rd party site Vend.com to connect to WooCommerce but it won’t do it. Here’s the log we get, as you can see it’s mentioning CloudFlare so we’re assuming that’s the issue. Could anyone advise what we do to stop CloudFlare blocking Vend?

ID                   1238123740456697856

GroupingID api-76dcd56cd8587f0678f55c94
URL https://www.peter-hall.co.uk/wp-json/wc/v2/taxes/classes
RequestMethod POST
Request POST /wp-json/wc/v2/taxes/classes HTTP/1.1
Host: www.peter-hall.co.uk
User-Agent: vend/integrations/625ee08/go1.13.8
Content-Length: 2
Authorization: [REDACTED]
Content-Type: application/json
Accept-Encoding: gzip

                 {}

StatusCode 403
Response HTTP/2.0 403 Forbidden
Cache-Control: private, no-cache, no-store, must-revalidate, max-age=0
Cf-Cache-Status: DYNAMIC
Cf-Ray: 572e85eb9c21f5a1-SEA
Content-Type: text/html
Date: Thu, 12 Mar 2020 15:24:37 GMT
Expect-Ct: max-age=604800, report-uri=“https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct
Pragma: no-cache
Server: cloudflare
Set-Cookie: __cfduid=de92e401a0d5d4b65e26a57fa8a5a22681584026677; expires=Sat, 11-Apr-20 15:24:37 GMT; path=/; domain=.peter-hall.co.uk; HttpOnly; SameSite=Lax
Set-Cookie: PHPSESSID=0c3c935eb2dcd028f4d7b39dc5a493a3; path=/
X-Turbo-Charged-By: LiteSpeed

                 <!DOCTYPE html>
                 <html style="height:100%">
                 <head>
                 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
                 <title> 403 Forbidden
                 </title></head>
                 <body style="color: #444; margin:0;font: normal 14px/20px Arial, Helvetica, sans-serif; height:100%; background-color: #fff;">
                 <div style="height:auto; min-height:100%; "> <div style="text-align: center; width:800px; margin-left: -400px; position:absolute; top: 30%; left:50%;">
                 <h1 style="margin:0; font-size:150px; line-height:150px; font-weight:bold;">403</h1>
                 <h2 style="margin-top:20px;font-size: 30px;">Forbidden
                 </h2>
                 <p>Access to this resource on the server is denied!</p>
                 </div></div></body></html>