Cal. Probate Code § 2643

(a) Except as provided in Section 2643.1, on petition by the guardian or conservator of the person or estate, or both, the court may by order authorize periodic payments on account to any one or more of the following persons for the services rendered by that person during the period covered by each payment: (1) The guardian of the person. (2) The guardian of the estate. (3) The conservator of the person. (4) The conservator of the estate. (5) The attorney for the guardian or conservator of the person or estate, or both. (b) Notice of the hearing on the petition shall be given for the period and in the manner provided in Chapter 3 (commencing with Section 1460) of Part 1. (c) The petition shall describe the services to be rendered on a periodic basis and the reason why authority to make periodic payments is requested. In fixing the amount of the periodic payment, the court shall take into account the services to be rendered on a periodic basis and the reasonable value of those services. The guardian or conservator of the estate may make the periodic payments authorized by the order only if the services described in the petition are actually rendered. The payments made pursuant to the order are subject to review by the court upon the next succeeding account of the guardian or conservator of the estate to determine that the services were actually rendered and that the amount paid on account was not unreasonable, and the court shall make an appropriate order if the court determines that the amount paid on account was either excessive or inadequate in view of the services actually rendered.