Merge pull request bitpay#91 from ppatidar2021/added_missing_property

Added forcedBuyerSelectedTransactionCurrency in invoice model

Merge branch 'ppatidar2021-retrieve_invoice_using_guid'

#v8.5.2203.0-rc - Invoice-Settlements-Refunds updated (bitpay#89)

- Settlements data updated
- Invoice payment for sandbox added
- Refunds creation updated
- Updated Apidocs
- Subversion upgrade
- Docs update

#v8.4.2202.0-rc - Refund model updated with reference property (bitpa…

…y#88)

#v8.3.2202.0-rc - Invoice update add autoVerify (bitpay#87)

* - Add autoVerify to Invoice Update for sandbox use

* - Apidoc uptate

* - Reference doc update

Co-authored-by: Antonio Buedo <[email protected]>

#v8.2.2201.0-rc - Invoice delete update (bitpay#86)

* - Invoice cancel updated

* - Apidoc uptate

Co-authored-by: Antonio Buedo <[email protected]>

#v8.1.2201.0-rc - Invoice model update (bitpay#85)

Co-authored-by: Antonio Buedo <[email protected]>

#v8.0.2201.3-rc - Refund status constants updated (bitpay#84)

* - Refund status constants updated

#v7.2.2111.0-rc - Error handler update (bitpay#80)

* - Error handler update

* - Apidoc uptate

#v7.1.2111.0-rc - Ready proxy update (bitpay#79)

* - Proxy credentials provider supported