How to handle Stripe subscriptions based on Currency? - stripe-payments

Question

I'm using the Stripe payment gateway for my SAAS app.
I have created a Product and multiple Plans are linked to it. Plans price is in USD.
I have created a new customer. Then I'm trying to subscribe to a Plan, but I'm getting the below error
You cannot combine currencies on a single customer. This customer has had a subscription, coupon, or invoice item with currency inr
I have seen their documentation, it is not allowing me to change the Currency of the customer.
Is there anyway I can convert USD to the currency of the customer before subscribing?

Answer 1

My recommendation would be to, prior to attaching the subscription, retrieve the customer object for which you'd like to have a subscription attached, determine the currency of the customer, and create a new plan (in the currency) if necessary. To do this though, you'd probably want to use a currency conversion API from a third-party, as Stripe does not support that.
Example in Python:
plan_id = ... # This would have been retrieved from your form, most likely (eg. 'basic-plan')
usd_plan = stripe.Plan.retrieve(plan_id)
cus = stripe.Customer.retrieve()
if cus.currency is not 'usd': # if the currency of the customer is not "usd"
# create a new plan id for currency (eg. 'basic-plan-cad')
plan_id = plan_id + '-' + cus.currency # check if there is a
# use a 3rd party to get the currency
amount_in_currency = amount * <API_CONVERSION_RATE>
# check that the plan doesn't already exist and create it otherwise
try:
stripe.Plan.create(
amount=amount_in_currency,
interval=usd_plan.interval,
product={
"name": usd_plan.product
},
currency=cus.currency,
id=plan_id
)
except Exception as e: # this may fail if the plan already exists
break
# create the subscription
sub = stripe.Subscription.create(
customer="cus_xxx",
items=[
{
"plan": plan_id, # this will either be the `basic-plan` or `basic-plan-{currency}
},
]
)