cannot read properties of undefined (reading 'sendmessage') for numbers not in contact list

[RMG94]

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[Diegocndd]

sendmessage is reserved for contacts (each contact and group has an id that must be passed to sendmessage).

[RMG94]

Thank you @Diegocndd.
What should I use to send a message to a number not exist in my contact list?

[Diegocndd]

I think the only way is using the link https://api.whatsapp.com/send?phone=xxxxxxxxx&text=yyyyyyy