{"title":"Calls and callbacks","category":"default","creationDate":1776961627,"content":"
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Adyen POS Object Creation\u00a0is a void method.<\/p>\n<\/div><\/div>\n

Calls and callbacks follow this flow:<\/p>\n

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  1. Invoke a method to perform a specific action.<\/li>\n
  2. Set a timer to wait for an application-internal flag.<\/li>\n
  3. In the callback pass the objects and results to internal objects, set the application-internal wait-flag and proceed to the end of the callback handler.<\/li>\n
  4. Proceed with the main flow - handle and process the information obtained in the callback.<\/li>\n<\/ol>\n
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    For methods from the COM extension for Windows that take arguments, carefully verify these arguments to avoid runtime errors.\u00a0There is no option to validate\u00a0the passed arguments.\u00a0The same applies to the callback arguments, the COM extension for Windows can not validate these for you.<\/p>\n<\/div><\/div>\n

    Callback Parameter Order<\/h2>\n

    The C library defines the order, \u00a0but does not enforce it. \u00a0As an example the create tender callback:<\/p>\n

    CreateTenderCB(objTender, intPedResult, intPspResult, intLibResult, strErrorMessage)<\/code><\/pre>\n
    The\u00a0CreateTender<\/code>\u00a0callback returns the tender object that should be used to execute subsequent tender-actions.\u00a0strErrorMessage<\/code>\u00a0can be used directly in logging or feedback.<\/p>\n
    Use the provided helper methods to evaluate the other arguments.\u00a0<\/p>\n
    Parameters are accessible through the interface in any standard coding tool.\u00a0If necessary, you can observe the IDL provided with the library using an OLE viewer.\u00a0<\/p>\n
    Actionable vs. Informational Callbacks<\/h2>\n
    Several callbacks occur during the processing of a tender. There are two types of callback: Actionable and Informational.<\/p>\n