Fixed verifySign method

• Fixed: Data sanitization in verifySign method

Fix refund parameters in refundByCustomId method

• Fixed: Send refund parameters in refundByCustomId method

Support Online Payment Query

• Added: New API - queryOnlinePayment

Support PHP up to version 8.1

• Added: Support PHP up to version 8.1
• Added: Add new acceptable parameters in setPaymentData method

Support PHP up to version 8.0

• Added: Support PHP up to version 8.0
• Fixed: Online payment client example

Support checkout domain id

• Added: setCheckoutDomainId method
• Added: new acceptable parameters in setMetadata method

Fix metadata

• Fixed: Metadata accept php version number only

Support Credit Card Online

• Added: Support Credit Card Online Gateway
• Added: Allow plugin pre-fill metadata and plugin information for online payment
• Added: Support partial refund

Support UnionPay

• Online payment support UnionPay ExpressPay and UnionPay UPOP

Add missing refund test

• Add missing refund test