Which part of the payroll process are you actually trying to automate
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Generation of payslips with constant payroll information → use recurrent payslips, see Payment amount from payslips - #9 by Patch
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Adding calculated tax amounts → see this idea thread Automating calculations in Payslips
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Bulk emailing payslips → see this idea thread Batch sending Payslip by Email
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Physically sending money to employees bank account - You would need to send instructions to a bank to do that, something Manager does not have an interface to support
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Importing the payment details back into Manager - use bank import or batch create, see Guides Import bank statements | Use bank rules to categorize imported transactions as well as How to batch import in manager - #11 by Patch and see this idea thread More advanced bank rules