To integrate Tabby just replace these files in the project files and then add the following lines to .env file
TABBY_TEST=true
TABBY_MERCHANT=ZamzamSA
TABBY_TEST_PUBLIC=pk_test_d3111348-1a81-4e29-9607-d7f8af79a3fb
TABBY_TEST_SECRET=sk_test_e761fa64-7bc4-400b-95b2-9954799a6f06
TABBY_PUBLIC=
TABBY_SECRET=
at production set TABBY_TEST to false and provide public and secret keys