Capability
Check whether a recipient address supports iMessage or RCS before sending a message.
Check iMessage capability
capability.check_i_message(CapabilityCheckiMessageParams**kwargs) -> HandleCheckResponse
POST/v3/capability/check_imessage
Check RCS capability
capability.check_RCS(CapabilityCheckRCSParams**kwargs) -> HandleCheckResponse
POST/v3/capability/check_rcs