message: Added wss URL's to cardpay SDK
diff: @@ -4,6 +4,9 @@ import { networkName } from './utils';
  const INFURA_PROJECT_ID = 'dfb8cbe2e916420a9dbcc1d1f5828406';
  const KOVAN_INFURA_URL = 'https://kovan.infura.io/v3';
  +const KOVAN_INFURA_WSS_URL = 'wss://kovan.infura.io/ws/v3';
  +const MAINNET_INFURA_URL = 'https://mainnet.infura.io/v3';
  +const MAINNET_INFURA_WSS_URL = 'wss://mainnet.infura.io/ws/v3';
  export const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000';
  const constants: {
  @@ -14,17 +17,24 @@ const constants: {
  sokol: {
  blockExplorer: 'https://blockscout.com/poa/sokol',
  rpcNode: 'https://sokol.stack.cards',
  + rpcWssNode: 'https://sokol-wss.stack.cards',
  relayServiceURL: 'https://relay-staging.stack.cards/api',
  transactionServiceURL: 'https://transactions-staging.stack.cards/api',
  },
  kovan: {
  blockExplorer: 'https://kovan.etherscan.io',
  rpcNode: `${KOVAN_INFURA_URL}/${INFURA_PROJECT_ID}`,
  + rpcWssNode: `${KOVAN_INFURA_WSS_URL}/${INFURA_PROJECT_ID}`,
  + },
  + mainnet: {
  + blockExplorer: 'https://etherscan.io',
  + rpcNode: `${MAINNET_INFURA_URL}/${INFURA_PROJECT_ID}`,
  + rpcWssNode: `${MAINNET_INFURA_WSS_URL}/${INFURA_PROJECT_ID}`,
  },
  - mainnet: {},
  xdai: {
  blockExplorer: 'https://blockscout.com/xdai/mainnet',
  - rpcNode: 'https://dai.poa.network',
  + rpcNode: 'https://rpc.xdaichain.com',
  + rpcWssNode: 'wss://rpc.xdaichain.com/wss',
  relayServiceURL: 'https://relay.cardstack.com/api',
  transactionServiceURL: 'https://transactions.cardstack.com/api',
  },
  