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Name	Description	Entity	Candidates
`amountToPay`	The amount which yet to be paid.	amount	amounts
`bic`	The bic of a payment recipient.	bic	bics
`docType`	The document type of a given document.	doctype	n/a
`iban`	The IBAN of a document sender.	iban	ibans
`paymentPurpose`	The payment purpose text	text	n/a
`paymentRecipient`	The payment recipient, beneficiary of a money transfer activity	companyname	paymentRecipients
`paymentReference`	The payment reference.	reference	n/a

We differentiate between paymentPurpose and paymentReferences on remittance slips only (Verwendungszweck vs. Zahlungsreferenz).

On invoices, you only find the paymentPurpose field.

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