Log in a customer and return access tokens

Exchanges the customer's credentials for access tokens. The storefront normally keeps the session in an HttpOnly cookie rather than handing the token to page scripts.

curl -X POST "https://example.com/v1/customer/login" \  -H "Content-Type: application/json" \  -d '{    "email": "string",    "password": "string"  }'

{  "accessToken": "string",  "refreshToken": null,  "expiresIn": 0,  "tokenType": "string",  "customer": null}