Yes, Alipay and WeChat Pay suspend their settlements during public holidays, below is the list of scheduled holidays in 2018.

New Year’s Day | 1 January 2018
Lunar New Year | 15 – 21 February 2018
Good Friday | 30 March 2018
Easter Monday | 2 April 2018
Ching Ming Festival | 5 – 7 April 2018
Labor day | 29 April – 1 May 2018
The Birthday of the Buddha | 22 May 2018
Dragon Boat Festival | 18 June 2018
The day following Hong Kong Special Administrative Region Establishment Day | 2 July 2018
Mid-Autumn Festival | 24 September 2018
The day following the Chinese Mid-Autumn Festival | 25 September 2018
National Day Holiday | 1 – 7 Oct 2018
Chung Yeung Festival | 17 October 2018
Christmas Day 25 December 2018
The first weekday after Christmas Day 26 December 2018