The maximum amount of items per page. Defaults to 50 when not provided.

= 1

"_links" subdivides into:

1 - "self" (object) - the link to the current page. Required.
1.1 - "href" (string) - the hypertext reference describing this link. Required.

2 - "first" (object) - the link to the first page. Required.
2.1 - "href" (string) - the hypertext reference describing this link. Required.

3 - "last" (object) - the link to the last page. Required.
3.1 - "href" (string) - the hypertext reference describing this link. Required.

4 - "prev" (object) - the link to the previous page. Required.
4.1 - "href" (string) - the hypertext reference describing this link. Required.

"_embedded" subdivides into:

1 - "id" (string) - ID of the callback.

2 - "callback_id" (string) - ID of the callback. Required.

3 - "interaction_id" (string) - the interaction ID of where the callback originates from.

4 - "campaign_id" (string) - The campaign ID of where the callback originates from.

5 - "record_id" (string) - the ID of the record list where the record comes from.

6 - "record_list_id" (string) - the ID of the record list that is scheduled to be called.

7 - "phone_number" (string) - the phone number that is scheduled to be called.

8 - "record_first_name" (string) - first name of the record that is scheduled to be called.

9 - "record_last_name" (string) - last name of the record that is scheduled to be called.

10 - "record_last_name" (string) - last name of the record that is scheduled to be called.

11 - "record_extra_data" (object) - extra data from the record that is scheduled to be called.

12 - "caller_id" (string) - the number that will be shown as the caller.

13 - "time_to_call" (string<date-time>) - the original time of the callback set by agent.

14 - "next_time_to_call" (string<date-time>) - the next time the callback will be retried.

15 - "timezone"
(string) - the timezone in which the callback is scheduled.

16 - "exclusive_to_agent"
(boolean) - this defines if a callback is for a specific agent.

17 - "agent_id"
(string) - the assigned agent id of schedule callback. Returns the callbacks which are specifically assigned to an agent (Myself only, Myself if available), or assigned to specific agents including her/him.

18 - "contact_id"
(string) - the ID of the contact that is scheduled to be called.

19 - "status"
(string) - the status of callback. Allowed values:
UNATTEMPTED,
TO_BE_RETRIED,
EXHAUSTED, SUCCESS,
CANCELED,
INVALID_NUMBER.

20 - "assign_type"
(string) - describes what assign type is this related to. Allowed values:
MYSELF_ONLY,
SPECIFIC_AGENT,
SPECIFIC_RING_GROUP,
MYSELF_IF_AVAILABLE,
ANY_ELIGIBLE_AGENT.

21 - "from_call_type"
(string) - describes what call type is this related to. Allowed values:
INBOUND,
MANUAL_OUTBOUND,
PROACTIVE_OUTBOUND.

22 - "dialing_model"
(string) - describes what dialing model is this related to. Allowed values:
PREDICTIVE, PREVIEW.

23 - "_links" (object)
23.1 - "self" (object). Required.
23.1.1 - "href" (string). Required.

"fields" subdivides into:

"name" (string)

"description" (string)