A sponsorship letter from an employer seems like a viable option for a case like this since your friend is not incorporated or freelancer but an employee. Sponsorship in immigration usually refers to either employers (for getting a work permit usually, so a bit of different scenario) or family. Best to email the embassy and ask for clarification. If you do not receive an answer within your acceptable timeline and can not provide any proof of the 500k, have your employer draft a sponsorship letter detailing their level of financial support to you.
It says that you should print it out or must print it out ? Let me know and I'll acknowledge my mistake.
Regarding phone, if you have lived long enough in Thailand, you should know that they use their phone more frequently than westerners and QR culture is much more developed there. They can for example withdraw money just with there phone and no bank card, something that has barely started in the West.
Embassy in Canada can take 1 business day and some embassies like France will take 20 business days. This is the range so far, not sure if somebody has seen longer posted time for an application filed correctly.
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.