You state:
DenisChenu wrote: I think the best things is creating a plugin for Joomla
Isn't that a contradict to this statement:
DenisChenu wrote: Then : no need to construct something in joomla.
No need to construct something in Joomla except writing a joomla plugin?
The main database is in Joomla. Respondent login and and can change data.
www.i-point.co.uk/cb-registration/registers
When conducting a study it quite normal to ask these questions again, since the profile might have changed and people mostly don't update the profile till they get a study invitation.
Joomla (AnswersProfile) -> Joomla (UpdateAnswersProfile) -> LimeSurvey (not asking for Profile) -> Joomla (NoUpdate)
Joomla (AnswersProfile) -> LimeSurvey (Prefill AnswersProfile) -> Joomla (UpdateProfile)
I would try to ask the profile questions inside Joomla and then redirect to LimeSurvey with just an id or token.
The technical debt (e.g. update issues) with another plugin on any side will be much higher.
The site runs Joomla 3.9.2. What LimeSurvey version is currently used?
I'm quite amazed that Marc go this amount of studies running via a Joomla Frontend.
Beside remote api a feature / plugin which does webhooks via POST and GET. E.g. like this:
help.surveygizmo.com/help/survey-webhook