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Responses use the customary HTTP status codes, with the most typical ones being:

Code Meaning
Successful Responses
200 OK
Error Responses
400 Bad Request
401 Unauthorized
403 Forbidden
404 Not Found
422 Unprocessable Entity
429 Too Many Requests
500 Internal Server Error

Each of the entities in the Dev API (Leads, People, etc.) has a /search endpoint. For requests sent to /search endpoints, the response header contains a field called X-PW-TOTAL. This value represents an upper bound of the total number of records returned in the search query. It allows the developer to estimate roughly how long it would take to extract the data when the results are paginated (See Paginating Search Results section).