https://fingate.stanford.edu/paying-people/how-to/mass-create-or-replace-labor-schedule-ptas
Mass Create or Replace Labor Schedule PTAs
The Replace Single PTA function replaces one PTA on an employee's existing Labor Schedule with a new
mass createreplacelaborscheduleptas
https://docs.whmcs.com/9-0/billing-and-invoicing/invoicing-tutorials/create-a-mass-payment-invoice/
Create a Mass Payment Invoice - WHMCS
Mass Payment allows customers to quickly and easily pay for multiple invoices in a single transaction, reducing your processing costs.
mass paymentcreateinvoicewhmcs