Fulfillments order or financial status update

I want to change the fulfilled or financial status of order by using api i know i have to do transition for financial status change or send fulfillment request for fulfillments order change i done every thing also explore the whole internet but i could not get exact payload which i submit in body of request and status is changed can any one please provide request payload for order submission to change status

Error are

“The fulfillment order’s assigned fulfillment service must be of api type”
while on transiction
not found error appear