Booking.com does not send a tax rate for extras. Therefore, for extras, the VAT rate of the accommodation is applied by default. If an extra (e.g. breakfast) has a different tax rate, this vat rate can only be applied to imported bookings, if you have an extra with the exact same wording in {{{#fas:cog}}. (CONFIGURATION) ACCOMMODATIONS > UPSELLING.
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If you want to access credit card details through Beds24 ask Booking.com to only accept bookings with credit card details and always send all details to Beds24.