Generally speaking, dream interpretation refers to a legend that people who have passed away transmit information through dreams. Asking for money in a dream may have different explanations, but it can usually be understood that the deceased is sending you some information or expressing some feelings.
First of all, it may be that the deceased is expressing his needs, which may be material needs, such as needing money to meet basic needs, or spiritual needs, such as needing your attention and care.
On the other hand, it may be that the deceased is sending you a message, for example, they want you to do something for them, or they have some unresolved problems that need your help.
Generally speaking, dream interpretation is a legend, and its meaning may vary from person to person. If you are confused about the meaning of dreaming, I suggest you seek the help of a professional psychological counselor.