PayPal PHP SDK release notes
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v0.16.1
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* Configurable Headers for all requests to PayPal
* Allows adding additional headers to every call to PayPal APIs
* SDK Config to add headers with http.headers.* syntax

v0.16.0
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* Enabled Webhook Management Capabilities
* Enabled Caching Abilities for Access Tokens

v0.15.1
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* Enabled Deleting Billing Plans
* Updated Samples

v0.15.0
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* Extended Invoicing Capabilities
* Allows QR Code Generation for Invoices
* Updated Formatter to work with multiple locales
* Removed Future Payments mandate on Correlation Id

v0.14.2
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* Quick Patch to Unset Cipher List for NSS

v0.14.1
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* Updated HttpConfig to use TLSv1 as Cipher List
* Added resetRequestId in ApiContext to enable multiple create calls in succession
* Sanitize Input for Price Variables
* Made samples look better and work best

v0.14.0
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* Enabled Billing Plans and Agreements APIs
* Renamed SDK name to PayPal-PHP-SDK

v0.13.2
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* Updated Future Payments and LIPP Support
* Updated Logging Syntax

v0.13.1
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* Enabled TLS version 1.x for SSL Negotiation
* Updated Identity Support from SDK Core
* Fixed Backward Compatibility changes

v0.13.0
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* Enabled Payment Experience

v0.12.0
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* Enabled EC Parameters Support for Payment APIs
* Enabled Validation for Missing Accessors

v0.11.1
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* Removed Dependency from SDK Core Project
* Enabled Future Payments

v0.11.0
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* Ability for PUT and PATCH requests
* Invoice number, custom and soft descriptor
* Order API and tests, more Authorization tests
* remove references to sdk-packages
* patch for retrieving paid invoices
* Shipping address docs patch
* Remove @array annotation
* Validate return cancel url
* type hinting, comment cleaning, and getters and setters for Shipping

v0.8.0
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* Invoicing API support added

v0.7.1
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* Added support for Reauthorization

v0.7.0
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* Added support for Auth and Capture APIs
* Types modified to match the API Spec
* Updated SDK to use namespace supported core library

v0.6.0
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* Adding support for dynamic configuration of SDK (Upgrading sdk-core-php dependency to V1.4.0)
* Deprecating the setCredential method and changing resource class methods to take an ApiContext argument instead of a OauthTokenCredential argument.

v0.5.0
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* Initial Release