• [16.x] Add requestOption when creating customers by @mbarreiro85 in #1692
• Set variable's default value to be an array aligning it with other Cashier variable defaults by @u01jmg3 in #1697
• Prevent address lock in Checkout (#1764) by @captainscorch in #1766
• [16.x] Stripe Basil API Support by @Diddyy in #1762
• [16.x] Test Improvements by @crynobone in #1767
• [16.x] Uses PHP Native Type Declarations 🐘 by @crynobone in #1769
• [16.x] Upgrade Guides by @crynobone in #1768