[App Integrations: Payments, WhatsApp, Instagram](https://freelancer.com/projects/api-integration/ap

[App Integrations: Payments, WhatsApp, Instagram](https://freelancer.com/projects/api-integration/app-integrations-payments-whatsapp.html) My app already runs smoothly on both iOS and Android, but the external services it relies on still need to be wired up. I want every major integration—payments, social, and messaging—implemented end-to-end so users enjoy a seamless experience without ever leaving the app. Payment gateway I have not locked myself into a single provider, so feel free to recommend the best fit (PayPal, Stripe, Square, or another PCI-compliant option). What matters most is secure tokenised transactions, flawless webhook handling for success / failure events, and clear error reporting in the UI. Instagram Users should be able to sign in with Instagram, pull basic pr...