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BACKOUT Verb Issued Remotely

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Image that shows how the BACKOUT verb is issued remotely.
BACKOUT verb issued remotely.

  1. The transaction program issues a SEND_DATA or MC_SEND_DATAverb depending on whether a basic or mapped conversation is being used.

  2. The SEND_DATA or MC_SEND_DATA VCB is passed transparently through the vendor API to Host Integration Server. When the verb completes the return code from Host Integration Server is returned to the transaction program.

  3. The transaction program issues a SYNCPT verb to the vendor API.

  4. The vendor API creates a PREPARE PS header and transmits it by issuing a SEND_DATA or MC_SEND_DATA verb. For a mapped conversation, the data_type field of the MC_SEND_DATA VCB must be set to AP_PS_HEADER.

  5. On completion of the SEND_DATA or MC_SEND_DATA verb, the vendor API issues a RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb.

  6. The RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb returns with a return code of AP_BACKED_OUT, indicating that the remote transaction program issued a BACKOUT verb.

  7. The vendor API issues another RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb to receive the Confirm indication.

  8. When the verb completes with the what_rcvd field of the VCB set to AP_CONFIRM, the vendor API issues a CONFIRMED or MC_CONFIRMED verb to acknowledge the BACKOUT verb.

  9. The SYNCPT verb is returned to the transaction program with a BACKED_OUT return code when the CONFIRMED or MC_CONFIRMED verb completes.