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They're very efficient in keeping publishers informed of merchant closures and changes in program policy, and in providing regular updates of new creatives, offers, etc.
They did recently add a section to their site which lists the individual email addresses for account managers of each merchant. That may help your mails reach the right person.
I work for TradeDoubler as our UK Head of Publisher Services. If you are not based in Europe and want to try working with TradeDoubler, please follow these instructions:
Being Paid Internationally
Working in our European markets
I am not desperate for the cash but as it is building up I will chase it down. I will even fly to the UK (24 hour flight) to get my cash.
Although it's nice to see the post from TD above sometimes it can be a little late when there are others in the marketplace that will pay on time, every time.
TD love taking your traffic but don't like to pay up!