How to start a WhatsApp chat via clickable phone numbers?
Use https://wa.me/<number> where the <number> is a full phone number in international format. Omit any zeroes, brackets, or dashes when adding the phone number in international format.
Examples:
Use: https://wa.me/1XXXXXXXXXXDon't use: https://wa.me/+001-(XXX)XXXXXXX