Add support for stores #26
Description
In the support thread at https://freescout.pronamic.nl/conversation/1276, only a single payment method from the Adyen merchant account was listed during checkout even though more methods were activated. It appeared that this was caused by the account using multiple 'stores', which is currently unsupported in this integration.
In the /session and /paymentMethods request for example, it seems a store parameter can be used to add support for stores:
storestring
Min length: 1 - Max length: 16
Required for Adyen for Platforms integrations if you are a platform model. This is your reference (on balance platform) or the storeReference (in the classic integration) for the ecommerce or point-of-sale store that is processing the payment.
https://docs.adyen.com/api-explorer/Checkout/71/post/paymentMethods#request-store