How to model our startup white label offering to sell to corporate clients?

Hi,
First of all, well done for all the amazing things that you've already done. This in itself is already a great achievement.
You are correct about the processes that you need to do and if I understand your question, you want to know how you can recruit the relevant professional with a limited (or not) budget.
The most common method is the use of equity (shares/stock). some professional, if they believe in the potential of the business, are willing to either work only for equity, or for a combination of a reduced fee and equity. As to how much equity, this depends on the potential of the business, the value of the service provided and other criteria.
If you're interested, I can connect you with a professional who can help with the sales process, and I can help with the business and legal side. I would need to hear more details about the business and industry - if you're interested and have an investor's deck or exec' summary, you're welcome to send it.
Good luck
I've successfully helped over 350 entrepreneurs, startups and businesses, and I would be happy to help you. After scheduling a call, please send me some background information so that I can prepare in advance - thus giving you maximum value for your money. Take a look at the great reviews I’ve received: https://clarity.fm/assafben-david

Have you thought about using Virtual Agents, Online experts via online platforms (you might be able to hire some from here as well)? Your concerns are valid and definitely you will need to create this muscle.

For our API offering, we do have a full service team from contract, engagement, integration, testing and post-go live support. But this was developed over time.

One thing I would say, as you have mentioned the team is solid, I would challenge you to think about how to automate a lot of these processes from the get go. I have seen multiple times companies creating manual / human processes and then automating them. Why don't start the other way.

More than happy to chat more: https://clarity.fm/salmanmalik

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Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath