Xero Invoice Sync 2.8.3

• Compatibility update for XF2.3.13/XF2.2.19 when viewing add-on options in the admincp
• Compatibility update for @DragonByte Tech's eCommerce v5.3.0 Beta 2+

• Fix error viewing add-on options on XF2.2
• Fix sales tax configuration for user-groups would cause errors for accounts without a tax rate set

• Fix syncing to xero when dbtech ecomerce is enabled but VAT is not

• Require StandardLib v1.23.0+
• Remove use of assert() usage as this is known to cause validation delays with XF Cloud
• Fix eCommerce 4.3+ compatibility
• Fix deleting access token
• Fix using deprecated scopes when setting up the oauth access token

• Fix XF2.2 support for syncing dragonbyte tech ecommerce products to xero

• Require php 8.0+
• Require StandardLib v1.20.0+
• XF2.3 support fixes
• @DragonByte Tech's eCommerce v4.0.0 support

• XF2.3 compatibility
• Fix missing schema changes Dragonbyte eCommerce is installed after this add-on
• Fix invoices paid purely by store credit not syncing

• Require StandardLib v1.19.0+
• Various code cleanups
• php 8.4+ compatibility work. Not fully compatible yet as the dependant library used to communicate with Xero hasn't been updated yet

• On username change, only sync users who are known to have a xero account to avoid creating more contacts than are needed

• Username change improvements
  • Xero contacts can now be updated, not just created
  • Fix username changing not properly syncing to Xero
  • Fix triggering sync on existing user would cause errors