You'll need to Amex Login after you download and launch the app., the same way you would on a computer, enter your login and password.
https://sites.google.com/usabank.info/amexlogin/home
https://sites.google.com/usabank.info/amex-login/home

PayPal is an e-commerce organization that helps individuals and small organizations across the globe in paying and receiving funds with its low-cost services. 
https://sites.google.com/view/paypalloginnusa/
https://sites.google.com/view/paypal-loginn/

Coinbase is in the process of sun-setting Coinbase Pro and migrating all its features to Coinbase with the Advanced Trade dashboard. https://sites.google.com/coinloginn.com/coinbasepro/home | https://sites.google.com/coinloginn.com/coinbaseprologin/home | https://sites.google.com/bitslogin.com/metamask-sign-in/home |

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https://sites.google.com/cryptocoinslogin.com/metamaskwallet/home
https://sites.google.com/view/coinbase-pro-logiin/home