Ok so spent a day on the different options.
There is the option for inline form or hosted (choose inline)
Customer portal yes/no. Tried with both
All give different errors but the furthest seems to give us
Missing required param: items[0][price_data][product]. Please contact site administrator to check error log.
Any idea what would allow this to pass the ingo, there is a price set
Would be so delightful to have just a simple crib screen shot of a working example of a paid subscription. If anyone has got it to work with strip I would be grateful for the advice as this is eating hours with little useful info returned from the errors that is answered in forums