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[jabe]

You'll only get three ots of back and lay with the Delayed App Key. matches should give you the data for the rightmost column on your image..

[jabe]

The returned data for listMarketBook includes a version number. That might be what you want.

[jabe]

I believe the difference is down to your use of "virtualise":"true". I can't remember all the details, but the use of virtualise uses...

[jabe]

Looks like you've got it. This worked:

"filter": {},"orderBy":"BY_BET","sortDir":"LATEST_TO...

[jabe]

I'm trying to think what a useful next step might be.

One thing you might try is the keepAlive call.

Just spotted the REST examples,...

[jabe]

My code is in Visual Basic.NET. I included a page in my program which allows testing of calls.

Has your program logged into Betfair?

[jabe]

Getting more difficult! I have run the call with filter from your latest post in the test part of my program and it worked.

Something more...

[jabe]

My apologies; I forgot to mention this.

When the documentation asks for a SET, like this

Set<String> or Set<marketBettingType>...

[jabe]

Your endpoint is missing a chunk. It should be
https://api.betfair.com/exchange/betting/rest/v1.0/

[jabe]

Try exBestOffersOverRides