WhatsApp Un-official API
Connecting a WhatsApp with ultramsg account to chat with customers over WhatsApp. USD39/mo after 3 days free trial.
This un-official API only for temporary use.
Settings >> Channels >> ADD channel >> Custom Channel

Put the following link in the box destination webhook URL , And do not forget to change the parameter instance_id & token of your instance in a ultramsg .
https://integration.ultramsg.com/respond.io/respond.php?instance_id=put_your_instance_id_here&token=put_your_token_here
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Now you will see this window:

Put the following link in the webhook URL in ultramsg , And do not forget to change the parameter channel_id & token as in the previous picture.
https://integration.ultramsg.com/respond.io/ultramsg.php?channel_id=put_your_channel_id_here&token=put_your_respond_io_token_here&webhook=https://app.respond.io/custom/channel/webhook/
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Now send a message from your WhatsApp number linked with Ultramsg , and You will see the chat in Yeshello.
Congratulations, now you can make chats, reply to customers, exchange files and media.