docs: @Nullable
      @TokenType
      private static String asTokenType(@Nullable String possibleTokenType) {
          if (possibleTokenType == null || TextUtils.isEmpty(possibleTokenType.trim())) {
              return null;
          }
  
          if (Token.TYPE_CARD.equals(possibleTokenType)) {
              return Token.TYPE_CARD;
          } else if (Token.TYPE_BANK_ACCOUNT.equals(possibleTokenType)) {
              return Token.TYPE_BANK_ACCOUNT;
          } else if (Token.TYPE_PII.equals(possibleTokenType)) {
              return Token.TYPE_PII;
          } else if (Token.TYPE_ACCOUNT.equals(possibleTokenType)) {
              return Token.TYPE_ACCOUNT;
          } else if (Token.TYPE_CVC_UPDATE.equals(possibleTokenType)) {
              return Token.TYPE_CVC_UPDATE;
          }
  
          return null;
      }