| 3 | rel | string | Relation of this link to its containing entity, as defined by IETF RFC5988 with many relation values specified in its [Section 6.2.2](https://datatracker.ietf.org/doc/html/rfc5988#section-6.2.2), for example:
* `self` - Link to the current resource latest state or with more detail
* `prev` - Previous page in a paginated result set
* `next` - Subsequent page in a paginated result set
* `first` - First page in a paginated result set
* `last` - Last page in a paginated result set
* `related` - Link to a related resource, like a Transaction's referenceTransactionId
* `up` - Link to a related 'parent' resource, like a child account's parent account
* `payment` - Link to a payment-scheduling endpoint
Specific to FDX, `rel` values can contain a data cluster or space-delimited list of data clusters which link to the referenced data type(s), for example:
* `ACCOUNT_DETAILED` - Link to the account's details via `/accounts/{accountId}`
* `PAYMENT_SUPPORT` - Link to the account's ID and bank ID for payments or transfers via `/accounts/{accountId}/payment-networks`
* `CUSTOMER_CONTACT` - Link to the account's customer contact details via `/accounts/{accountId}/contact`
* `TRANSACTIONS` - Link to the account's transactions list via `/accounts/{accountId}/transactions`
* `REWARDS` - Link to the account's reward program via `/reward-programs/{rewardProgramId}`
* `TRANSACTIONS REWARDS` - Specific link to the account's transaction rewards via `/accounts/{accountId}/reward-transactions`
* `STATEMENTS` - Link to the account's statements list via `/accounts/{accountId}/statements`
* `IMAGES` - Link to the transaction's images list via `/accounts/{accountId}/transaction-images/{imageId}` |