Authenticate to the ADP API using OAuth2 client_credentials with mutual TLS as required by ADP (see ADP mTLS auth documentation)
Identify the open Pay Data batch for the current payroll cycle for the target company using the payroll cycle endpoints
Construct a batch payload including the worker's aoid (ADP's worker identifier), the deduction code for the garnishment type (e.g., child support or tax levy), and the deduction amount
Submit the pay data batch via POST to the Payroll Data Input API endpoint; a batch call can include multiple workers in a single request
Confirm the batch was accepted by checking the response status and any returned batch ID
Retain the garnishment order reference number in the batch metadata for audit and remittance reconciliation
Known gotchas
Federal CCPA limits garnishment of disposable earnings for most debts to 25% of disposable earnings or the amount by which earnings exceed 30 times the federal minimum wage, whichever is less — your deduction amounts must not exceed this limit; consult current DOL Fact Sheet #30 for up-to-date figures
ADP uses the worker's aoid (Associate OID) as the primary identifier — SSN or employee number alone will not route the deduction correctly
Garnishment deduction codes in ADP are client-configured and vary per account; confirm the exact deduction code with the ADP administrator before submitting, as wrong codes may be silently applied to a different deduction bucket
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