// Stripe
const customer = await stripe.customers.create({ email: 'user@saas.com' });

// TagadaPay
const customer = await tagada.customers.create({
  storeId: 'store_xxx',
  email: 'user@saas.com',
  firstName: 'Alex',
  lastName: 'Founder',
});

// Stripe (browser)
const { paymentMethod } = await stripe.createPaymentMethod({ type: 'card', card: element });
await stripe.paymentMethods.attach(paymentMethod.id, { customer: customer.id });

// TagadaPay (browser → server)
// FRONTEND:
const { tagadaToken } = await tokenizeCard({ cardNumber, expiryDate, cvc });

// BACKEND:
const { paymentInstrument } = await tagada.paymentInstruments.createFromToken({
  tagadaToken, storeId, customerData: { email, firstName, lastName },
});

// Stripe
const paymentIntent = await stripe.paymentIntents.create({
  amount: 1900, currency: 'eur', customer: customer.id,
  payment_method: paymentMethod.id, confirm: true,
});
const subscription = await stripe.subscriptions.create({
  customer: customer.id, items: [{ price: 'price_xxx' }],
});

// TagadaPay
const { payment } = await tagada.payments.process({
  amount: 1900, currency: 'EUR', storeId,
  paymentInstrumentId: paymentInstrument.id,
  customerId: customer.id, initiatedBy: 'customer',
  paymentFlowId: 'flow_xxx',
});
const { subscription } = await tagada.subscriptions.create({
  customerId: customer.id, priceId: 'price_xxx', storeId,
  currency: 'EUR', defaultPaymentInstrumentId: paymentInstrument.id,
  paymentId: payment.id,
});

// Stripe
const event = stripe.webhooks.constructEvent(rawBody, sig, secret);

// TagadaPay
const event = tagada.webhooks.constructEvent(rawBody, req.headers['x-tagadapay-signature'], secret);

Stripe:  locked to Stripe
TagadaPay: sandbox → TPA → Stripe → Checkout.com (one vault)

await tagada.subscriptions.changeProcessor({
  subscriptionIds: ['sub_xxx'],
  processorId: 'processor_new',
});