When you have official approval, you have all the approval you need to do whatever is needed.
A word that means to give official approval to is to ratify.
To give approval in government = ratify.
Official approval is sanction.
charter
Official approval is sanction.
Home Loans and RBC are two popular company's that can give you a mortgage loan pre approval. They offer a lot of advice and descriptions on this service on their official sites.
Endorse
"Endorsement" is an 8-letter word that means official approval or support.
Approval, assent, acquiescence can all mean to give permission.
The word is accede. It means agree to a request or a demand.
Give a lot of public attention and approval to (someone); treat as a celebrity
ratification