FAQFrequently Asked Questions AllAuthenticationSendingTemplatesWebhooksErrorsWhich authentication method should I use?+Where can I find my API Key?+Can I have multiple API Keys for the same account?+Does accepted: true mean the message has been delivered?+Can I send WhatsApp messages without a template?+What happens if the RCS fallback fails?+How do tracked links work?+What is the difference between SMS Universal and Legacy?+How long does it take for a WhatsApp template to be approved?+Can I modify an approved template?+What types of RCS templates exist?+How do I configure my callback URL?+What do I receive when the user replies?+How long is the media download URL valid?+What does a 400 Bad Request mean?+What does a 401 Unauthorized mean?+What does a 403 Forbidden mean?+What should I do on a 500 Server Error?+What does a 429 Too Many Requests mean?+