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[Update a mass payment](https://developers.dwolla.com/docs/api-reference/mass-payments/update-a-mass-payment) [Retrieve a mass payment](https://developers.dwolla.com/docs/api-reference/mass-payments/retrieve-a-mass-payment) [Initiate a mass payment](https://developers.dwolla.com/docs/api-reference/mass-payments/initiate-a-mass-payment)