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Regarding Blockchain.info's Receive Payments API V2:

The 'Generating a Receiving Address' feature requires a callback_url, to which they send a notification of EVERY confirmation. For every transaction, potentially thousands of notifications will be sent to the callback_url.

  1. When I use the 'Generating a Receiving Address' feature, can I receive a new address WITHOUT specifying a callback_url?

  2. If I must specify a callback_url: a. Is there any way to cancel the callbacks? b. Can I limit the number of notifications that are sent?

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1) No

2) your callback url must respond with the text "*ok*" without quotes and nothing else, just text. This will stop Blockchain.info from sending further notifications.

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