I have created an application in developer portal and it is still in ‘waiting’ status. If someone from Infusionsoft team can have a look at that - please do that, cause we can’t continue our work.
Your first Application Key is always auto-approved; for subsequent ones you will need to go through a manual approval process with the API Support team. Please submit a ticket here to get started:
https://developer.infusionsoft.com/support/tickets/create/