Altapay

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**Improvements**

- **Backwards incompatible** Changed the return type of ``altapay.Transaction.charge_subscription()``. It will not return a ``altapay.Callback`` object instead of a list of transactions
- **Backwards incompatible** Changed the argument of ``altapay.Callback.transactions()`` to be keyword only. Will now accept any number of filters, and these will be matched using AND logic

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**Features**

- Added ``altapay.Transaction.charge_subscription()`` which will charge a subscription on a transaction, if this transaction is setup as a subscription

**Bugfixes**

- Fixed a bug where looking up a non-existent transaction ID would result in a ``KeyError`` (32)

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**Bugfixes**

- Added missing apostrophe's in the documentation for the callback guide (24)
- Fixed a bug where filtering transactions on a ``altapay.Callback`` object might result in a ``KeyError`` (25)

**Improvements**

- Made it more explicit how attributes on response objects work (26)

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**Features**

- Added ``altapay.Transaction`` and the ability to find a transaction by its transaction ID in the AltaPay service
- Added ``altapay.Transaction.capture()`` which captures a transaction that has already been loaded. Optinally, parameters can be passed which allows for partial captures (see the AltaPay documentation for full list of possible arguments)
- Added a public facing API for converting an AltaPay XML response (as a string) to a Python dictionary (``altapay.utils.xml_to_dict``)
- Added ``altapay.Callback`` which wraps a callback response from AltaPay, and automatically wraps the coupled transactions in ``altapay.Transaction`` objects

**Bugfixes**

- Fixed a bug where specifying a non-existing terminal while creating an ``altapay.Payment`` object would result in ``altapay.Payment.success`` returning ``True``
- Fixed a bug where running in production mode was not possible. It is now possible by specifying a shop name when instantiating the API

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- Complex payments are now possible. This means it is now possible to send detailed payment information in a Pythonic way using just lists and dictionaries, instead of the PHP style query params syntax
- Documentation now includes a small guide for available parts of the SDK, which will make is easier to get started easily without reading the raw API documentation

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- Basic API connection class implemented in ``altapay.api.API``
- Basic Payment class implemented in ``altapay.payment.Payment`` which is currently mainly for creating a very basic payment request with the AltaPay service