Pyxero

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291 - Correct representation of boolean fields
294 - Correct saving of updated Invoices
300 - Add filtering by ID
302 - Correct handling of XML body format.
303 - Removed support for Private Apps
304 - Add support for the Payment Services API
309 - Allow an (optional) authorization event ID when retrieving tenants
310 - Add Python 3.9 support
314 - Added support for HTTP429 rate limit handling

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208 - Support the journal date field
211 - Improve error handling when an API response is unparseable
219 - Corrected declaration of boolean fields on Items
222 - Correct the handling of the AmountPaid field
232 - Made the API URL configurable
245 - Ensure ``put_attachment`` returns a response.
249 - Add support for the Batch Payments API
250 - Correct the handling of user agents.
254 - Add support for the History API
259 - Corrected boolean handling of DiscountEnteredAsPercent
265 - Add support for Super Funds to the Payroll API
266 - Add support for Payroll object names.
269 - Added new endpoints to support the Invoice API
271 - Improved example of OAuth flow
273 - Add support for the Projects API
278 - Added an OAuth2 authentication implementation
282 - Add support for the Quotes API

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241 - Added support for Python 3.5-3.7
234 - Correct PyJWT pinned version
207 - Correct PyJWT pinned version
165 - Correct declaration of some Boolean fields

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- 179 - Change cryptography setup version (thanks João Miguel Neves).
- 170 - Add User-Agent customisation on OAuth related requests.
- 168 - Deprecate Entrust Certificates for Partners API (thanks Sidney Allen).
- 157 - Add PurchaseOrders handling (thanks vadim-pavlov).
- 153 - Add TaxComponents handling (thanks Richard Bell).
- 152/150 - Improve Xero Exceptions handling (thanks Jarek Glowacki, Craig Handley and Brendan Jurd).
- 151 - Add delete method in BaseManager (thanks Craig Handley).

*Bugfix:*
- 173 - Send Content-Length as string for working attachment uploads (thanks João Neves).
- 154 - Handle wrong date timestamp format received from Xero (thanks Matt Healy).
- 149 - Change Tracking Category structure in Invoices API (thanks Jacob Hansson).
- 142 - Extend BOOLEAN_FIELDS in BaseManager (thanks Alex Burbidge).
- 138 - Indentation fix in BaseManager (thanks Asav Patel).
- 137 - Fix incorrect field parsing with filters (thanks Alexander Rakowski).
- 90/91 - Pin version of cryptography (thanks Aidan Lister).

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