Hi Frederic,
at the moment Google does not allow usage of different API keys from the same domain (https://booking.drivenot.com) and this is something that we are trying to negotiate with Google with no luck so far.
Right now the section with your own API keys is not functional even if you have provided your keys.
We hope for a positive outcome with Google, otherwise, we will have to change our pricing model.
Hope this helps.
Kind regards.
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