developer account at developer.paypal.com :
    username: hikari.software@gmail.com
    password: niko1492TSUKUBA

merchant account (business):
    sb-zspc113761107@business.example.com
    pwd: EYL-li1p
    REST API:
    sandbox:
    client ID: AWbY4OUYklCavW4ABkRni0aByYMQljJDD7vQmkzDa-OUh2Hb6LHSfhCS6uDA5oJqqW8oAkVLqk7e5sSV
    client secret: EN6mU4_QK0H2nNF9w9DceFvV1QBPt4Mox11QOk-NqW2RDTCU4Kf5dilbncvc7c0ugy7JCCM2YI9gnATN

    NVP/SOAP Sandbox API credentials:
    username: sb-zspc113761107_api1.business.example.com
    pwd: EP4QP5RTSAFFVFDZ
    signature: AxTRlKRjNRdaZJcMuXFEDt2RlpVTAx6eJoxRi084Lgya0bwe99f6PksE

    Account ID: 9B4HS6BJCZ9RS

client account (personal):
    sb-kp9bf13762189@personal.example.com
    pwd: J_MNj8pI
    Account ID: V9V7RAZPUDCCA