AccrualsService.addOrUpdateAccrual(
  @vendorRecordId,
  @matterIdOdNumber,
  @month,
  @year,
  @amount,
  @accrualRecordId
);

@vendorRecordId
The record identifier of the Vendor record.

@matterIdOrNumber
The Matter Number or the record identifier of the Matter record.

@month
The 3-character reference to month name.
(Must be restricted to following value set [Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec])

@year
The 4-digit year value as a string.

@amount
The amount for your accrual greater than 0.

@accrualRecordId
Optional. The record identifier. of the Accrual record to be updated.

The function call will return an object of type: advspm__Accrual__c.

List<advspm__Accrual__c> accrList = AccrualsService.addOrUpdateAccrual( 'a059000000RJhKTEAA', 'b126000000ghrEAABA', 'Jan', '2023', 5000, '' );

OR

List<advspm__Accrual__c> accrList = AccrualsService.addOrUpdateAccrual( 'a059000000RJhKTEAA', 'MAT-LK-2023', 'Mar', '2023', 2500, '' );