In Canada, client company usually send what we call an EFT confirmation that accountant require at the end of the year to reconcile. It is usually send by email as an attachment for proof of invoice payment. Again, I am not sure that it is necessary in our cases but I added this.
My knowledge is only based on my case that is similar to yours. They did not ask for those invoices but I added them along with confirmation of payment. I think their main concern is why you incorporated in 2023, your history and experience before and your goals. I was with the Canadian embassy.
I am in the same situation as you. I used to own a construction for a few years until I sold it and became a consultant and incorporated a new company in 2023 so I had to explain a bit of my background and history. I also attached invoices from clients and EFT confirmation. I would not go to the soft option right away, I am sure you will be approved.
It was a mix of both. I can share my letter with you if that helps. It is basic but it was also following a request for document from the embassy. Did you also include registration of the business. I am sure you did but just checking.
I think I was in a similar situation. I am a business consultant with my own limited company. My company pays me directly and my clients pay my company.
I wrote a letter explaining my work, my vision and name of my clients company, with a short descriptions for each client. It was brief but I got approved.
I used an agent in Phuket that was great. Got 2 visa for my girlfriend to France which is Schengen Space. You can also do the application yourself for I recommend an agent for this one.
Find a Thai that you are close to who you can send wise to and they will give you cash. I have done this after getting tired of the ATM cost and until I got a bank account. I did this for one year with no issue.