Only MARKETING and UTILITY template can have multiple buttons of different type.
Templates can have a maximum of 10 buttons with certain limitations on each type and combination.
CATALOG and MPM templates can have only one button.
AUTHENTICATION templates can have only one button and its type must be OTP.
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Limitations
Templates are limited to a maximum of 1 button of type PHONE_NUMBER.
Templates are limited to a maximum of 2 buttons of type URL.
Templates are limited to a maximum of 10 buttons of type QUICK_REPLY.
If using quick reply buttons with buttons of some other type, buttons must be organized into two groups: quick reply buttons and non-quick reply buttons. If grouped incorrectly, the API will return an error indicating an invalid combination.
MARKETING Templates are limited to a maximum of 1 button of type COPY_CODE.
UTILITY templates cannot use COPY_CODE.
MARKETING and UTILITY templates cannot use button of type OTP.