Before he left, Yang Qing had already communicated with the heads of the Green Jade Pavilion and appraised them of his intent to visit several of the subsidiaries and main stores. He had left it to them to inform those subsidiaries and main stores of his arrival to avoid the hustle of a mixup in identities where those store owners and staff don't believe he is who he says he is. After all, the Green Jade Pavilion owner was an unknown who had never made an appearance up until Yang Qing was given that identity.
People would distrust someone they had never seen even if he had the jade token. It was better if the information came from someone they did know.
Seeing the complications in the Moonpine Kingdom, he was glad for the arrangements he had made. A second later, the store owner of the Serenity Ambrosia vouched for him even telling the general that he could come in person to do so, which the general said was not necessary.