AI-generated Key Takeaways
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          The header object is required for all server requests and includes details like request ID, timestamp, protocol version, and payment integrator account ID. 
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          The requestIdis a unique identifier with a maximum length of 100 characters, comprising only alphanumeric characters, colon, hyphen, and underscore.
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          requestTimestampis crucial for validation, as the receiver must ensure it's within ± 60 seconds of the current time, rejecting otherwise and acknowledging its non-idempotent nature.
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          Both protocolVersionandpaymentIntegratorAccountIdare mandatory fields within the header, specifying the request's version and identifying a unique account with contractual limitations, respectively.
Header object that is defined on all requests sent to the server.
| JSON representation | 
|---|
| { "requestId": string, "requestTimestamp": { object ( | 
| Fields | |
|---|---|
| requestId | 
 REQUIRED: Unique identifier of this request. This is a string that has a max length of 100 characters, and contains only the characters "a-z", "A-Z", "0-9", ":", "-", and "_". | 
| requestTimestamp | 
 REQUIRED: Timestamp of this request. The receiver must verify that this timestamp is ± 60s of 'now', and reject the request if it is not. This request timestamp is not idempotent upon retries. | 
| protocolVersion | 
 REQUIRED: The version of this request. | 
| paymentIntegratorAccountId | 
 REQUIRED: Identifies a unique account with contractual constraints. |