I have a list of phone numbers and a message string. I want to be able to send the message to all the numbers at once. I am using React Native's Linking module and deep links to do this.
I have tried various urls but none of them work.
https://api.whatsapp.com/send?phone=91xxxxxxxxx&text=hi works but only for a single number.
https://api.whatsapp.com/send?text=hi&phone=91xxxx&phone=91yyyy is valid but it only considers the last number.
None of &phone=91xxx,91yyyy, &phone=91xxxx;91yyyy, &phone=91xxxx:91yyyy, &phone=[91xxxx,91yyyy] are even valid.
Edit: If I leave out the &phone= key, then it opens the share sheet and lets me choose the contacts there. But that is not what I want. I want the contacts in the list to be pre-selected already, like it does with the single number case.