implement stripe in angular code example

Example 1: stripe angular

npm install stripe-angular --save

Example 2: stripe angular

<stripe-card #stripeCard
  (catch)        = "$event"
  [(token)]      = "token"
  [(invalid)]    = "invalidError"
  (cardMounted)  = "cardReady = 1"
></stripe-card>

<button type="button" (click)="stripeCard.createToken(extraData)">createToken</button>