This is a breaking change because it removes support for the
EnableWhatsAppSandboxConversations flag (and just overall the
ability to pass "Features" to a Client).
The Conversations API now properly supports the Sandbox, so users
who wish to send messages over the WhatsApp sandbox can simply
remove their usage of EnableWhatsAppSandboxConversations; they
only need to provide the correct channel ID for the sandbox
This is a breaking change because it removes support for the EnableWhatsAppSandboxConversations flag (and just overall the ability to pass "Features" to a Client). The Conversations API now properly supports the Sandbox, so users who wish to send messages over the WhatsApp sandbox can simply remove their usage of EnableWhatsAppSandboxConversations; they only need to provide the correct channel ID for the sandbox