Support for including merchant Invoice number

Support for including merchant Invoice number.

Bug fix

Fixed the bug in EMV flow. Transaction get stuck for ever.

Removing the XCTest dependency

Remove the Test target and test classes

Truncating customer signature

Truncating customer signature from logs.

A minor fix

SDK returns the error object as well with the flag.

Bug fix

SDK doesn't respond if continuos actions are being taken(CANCEL/CONFIRM/AUTHORIZE) without any delay.

Added flag to check if the transaction was successful

Though API provides error code to check the status of the transaction, added a flag to check if the transaction was successful.

Minor feature added

Added sound and banner to alert user for card removal.

Minor fix in EMV flow

Minor fix to avoid cancel at final stage in EMV flow

Added support for Terminal ID

Bug fix in EMV fall back flow and added support for Terminal ID.