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Egyptian eReceipt OAuth2 Client Credentials

See more Egypt eReceipt Examples

Get an OAuth2 access token for the Egyptian eReceipt REST API using client credentials (no interactivity with a web browser required). AutoIt

Local $bSuccess = False

;  This example assumes the Chilkat API to have been previously unlocked.
;  See Global Unlock Sample for sample code.

$oHttp = ObjCreate("Chilkat.Http")

;  Note: Any provider of a REST API, such as the Egyptian government in this case, can make life 
;  much easier for developers by providing one or more of the following in the API documentation:
;  
;  1) A sample CURL statement for each API call.
;  2) A Postman collection, or Swagger/OpenAPI specification file.
;  3) A sample of a raw HTTP request and response for each API call.
;  
;  The sample CURL statements or raw HTTP request/responses do not need to comprehensively show all 
;  possible options.  Providing a sample allows one to quickly make a successful API call.
;  It also allows for code generation directly from the CURL, Postman collection, or raw request/response,
;  and it tends to answer all questions about the format/structure of a request that, suprisingly,
;  remain ambiguous or not obvious in other forms of documentation.

$oReq = ObjCreate("Chilkat.HttpRequest")
$oReq.AddParam "grant_type","client_credentials"
;  Use your actual client ID and client secret...
$oReq.AddParam "client_id","d0394a9f-0607-40de-a978-2d3eb8375b04"
$oReq.AddParam "client_secret","6d62315e-d65a-4e41-9112-4195ea834edf"

$oReq.AddHeader "posserial","1234567899"
$oReq.AddHeader "pososversion","os"
$oReq.AddHeader "posmodelframework","1"
$oReq.AddHeader "presharedkey","03ac674216f3e1..."

;  When writing this example, the documentation at https://sdk.invoicing.eta.gov.eg/ereceiptapi/01-authenticate-pos/
;  shows us the HTTP verb and path (POST /connect/token), however,
;  we don't see the actual domain where the request is to be sent.
;  What are the endpoints???
;  It took some searching, but we found some endpoints here:  https://sdk.invoicing.eta.gov.eg/faq/
;  It's not immediately apparent which endpoint is to be used with a given API call.
;  Why not just include the endpoint in the documentation for each REST API call?
;  Endpoints are literally the #1 thing that needs to be known.
;  They can't just be buried in a FAQ.  They should be up-front and obvious.
;  
;  So.. we're guessing the endpoint is likely "https://invoicing.eta.gov.eg/connect/token"
$oReq.HttpVerb = "POST"
$oReq.ContentType = "application/x-www-form-urlencoded"

$oResp = ObjCreate("Chilkat.HttpResponse")
$bSuccess = $oHttp.HttpReq("https://invoicing.eta.gov.eg/connect/token",$oReq,$oResp)
If ($bSuccess = False) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

$oSbResponseBody = ObjCreate("Chilkat.StringBuilder")
$oResp.GetBodySb($oSbResponseBody)

$oJResp = ObjCreate("Chilkat.JsonObject")
$oJResp.LoadSb($oSbResponseBody)
$oJResp.EmitCompact = False

ConsoleWrite("Response Body:" & @CRLF)
ConsoleWrite($oJResp.Emit() & @CRLF)

Local $iRespStatusCode = $oResp.StatusCode
ConsoleWrite("Response Status Code = " & $iRespStatusCode & @CRLF)
If ($iRespStatusCode >= 400) Then
    ConsoleWrite("Response Header:" & @CRLF)
    ConsoleWrite($oResp.Header & @CRLF)
    ConsoleWrite("Failed." & @CRLF)
    Exit
EndIf

;  If successful, the OAuth2 access token JSON looks like this:

;  {
;    "token_type": "Bearer",
;    "access_token": "eyJraW......R2sbqrY",
;    "expires_in": "3600",
;    "scope": "..."
;  }

Local $sToken_type = $oJResp.StringOf("token_type")
Local $sAccess_token = $oJResp.StringOf("access_token")
Local $sExpires_in = $oJResp.StringOf("expires_in")
Local $scope = $oJResp.StringOf("scope")