Add `mau_appservice_trial_days` config (#12619)

* Add mau_appservice_trial_days

* Add a test

* Tweaks

* changelog

* Ensure we sync after the delay

* Fix types

* Add config statement

* Fix test

* Reinstate logging that got removed

* Fix feature name

1 files changed, 14 insertions, 0 deletions

diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md

index 36db649467..21dad0ac41 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -627,6 +627,20 @@ Example configuration:
 mau_trial_days: 5
 ```
 ---
+Config option: `mau_appservice_trial_days`
+
+The option `mau_appservice_trial_days` is similar to `mau_trial_days`, but applies a different
+trial number if the user was registered by an appservice. A value
+of 0 means no trial days are applied. Appservices not listed in this dictionary
+use the value of `mau_trial_days` instead.
+
+Example configuration:
+```yaml
+mau_appservice_trial_days: 
+  my_appservice_id: 3
+  another_appservice_id: 6
+```
+---
 Config option: `mau_limit_alerting`
 
 The option `mau_limit_alerting` is a means of limiting client-side alerting