Create a new EFT Collection from an existing EFT Mandate

post https://www.dev.api.revio.co.za/v2/collection/eft/from_mandate

Field descriptions:
mandateId: The identifier for the mandate used for this collection.

collectionDate: The date on which to action this collection.

amountCents: The amount (cents) to collect.

externalReference: A unique reference, which can later be queried for this collection. If this value is not unique you will get a HTTP 400 response ("Collection with this external reference already exists")

serviceType: The type of EFT to create for this collection.
Accepted values: ONEDAY, TWODAY, SAMEDAY.