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====================
The taler URI scheme
====================
The `taler` URI scheme represents actions that are processed by a Taler wallet. The basic syntax is as follows:
.. code:: none
'taler://' action '/' params
--------------------
Requesting a Payment
--------------------
Payments are requested with the `pay` action. The parameters are a hierarchical identifier for the requested payment:
.. code:: none
'taler://pay/' merchant-host '/' merchant-query '/' merchant-instance '/' order-id [ '/' session-id ]
The components `merchant-host`, `merchant-query` and `order-id` identify the URL that is used to claim the contract
for this payment request.
To make the URI shorter (which is important for QR code payments), `-` (minus) can be substituted to get a default value
for some components:
* the default for `merchant-instance` is `default`
* the default for `merchant-query` is `/public/proposal`
The following is a minimal example for a payment request from the demo merchant, using the default instance and no session-bound payment:
.. code:: none
taler://pay/backend.demo.taler.net/-/-/2019.08.26-ABCED
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