Whatsapp business API verification

#1

Can you kindly assist
Which is the cheaoest whatsapp service provider for API intergration sigunp. Would like to know also how many weeks does it take to receive an aprroval message from What’sapp if you signup via twillio.
Any suggestions? I would like to connect a bot hosted on another cloud

#2

Once I was integrate WhatsApp API with this gb whatsapp apk and it take 2 days to approved from twillio, I don’t why it take so time to approve it but I think you should also have to wait for two days to approve your signup verification.