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The srt_settings of a source say how its SRT stream is received. Which fields are required depends on the mode and on what is enabled; each field says when it is required. Field names are written as they appear in the JSON, so minimumLatency rather than minimum_latency.
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minimumLatency
integer
required

Specifies the latency value (in milliseconds) in the receiving direction of the socket.

Required range: 20 <= x <= 8000
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mode
enum<string>
required

Caller mode means that the consumer connects to the server that returns video data. Listener mode means that the server listens for incoming connections from the consumer.

Available options:
listener,
caller
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aesEncryption
object

AES encryption settings.

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ip
string

IP address or hostname of the SRT sender to connect to (caller mode). Required when mode is caller.

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port
integer

Port of the SRT sender to connect to (caller mode). In listener mode the service listens on a port of its own, reported in the transport statistics. Required when mode is caller.

Required range: 1000 <= x <= 65535
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redundantSource
object

A second connection carrying the same stream, merged with the first so the source survives the loss of either connection. In caller mode it dials the address given here; in listener mode the sender delivers the second copy to the source's secondary ingress URL. With AES encryption on, it uses the backup key material.

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srtPassthrough
SRT Passthrough · object

Passing the stream on over SRT to consumers of your own. In listener mode consumers connect to the source's passthrough URL; in caller mode the service connects to the consumer at the given address.

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whitelistedIpAddresses
string<ipv4>[]

List of IP addresses permitted to connect to the SRT server. Applicable for listener mode. Required unless mode is caller.