fix(alipay): add 'string' as an alternative type for 'pay()' input pa…

…rameter; (#2172)

change 'installVariables' name to 'ALI_PID' for Alipay cordova plugin

src/@ionic-native/plugins/alipay/index.ts

@@ -101,17 +101,17 @@ export interface AlipayOrder {
  plugin: 'cordova-alipay-base',
  pluginRef: 'Alipay.Base',
  repo: 'https://github.com/xueron/cordova-alipay-base',
- install: 'ionic cordova plugin add cordova-alipay-base --variable APP_ID=your_app_id',
- installVariables: ['APP_ID'],
+ install: 'ionic cordova plugin add cordova-alipay-base --variable ALI_PID=your_app_id',
+ installVariables: ['ALI_PID'],
  platforms: ['Android', 'iOS']
 })
 @Injectable()
 export class Alipay extends IonicNativePlugin {
  /**
  * Open Alipay to perform App pay
- * @param order { AlipayOrder } alipay options
+ * @param order { AlipayOrder | string } alipay options
  * @returns {Promise<any>} Returns a Promise that resolves with the success return, or rejects with an error.
  */
  @Cordova()
- pay(order: AlipayOrder): Promise<any> { return; }
+ pay(order: AlipayOrder | string): Promise<any> { return; }
 }