One step in the WA.Expert builder, the External API Request step, lets you wire WhatsApp into AI models, payment gateways, your store, your CRM, and thousands of other services. These guides show you exactly how, field by field, for free. No signup, no gate.
Connect a large language model so your bot can answer open questions in natural language. Bring your own API key from the provider; you pay them directly for usage, with no markup from us.
x-goog-api-key header, generateContent endpoint. Flagship guide with worked example and HowTo schema.
Read guide →Bearer auth, chat completions endpoint, system messages. The most widely used models.
Read guide →x-api-key auth, anthropic-version header required, max_tokens mandatory. Different pattern from OpenAI.
Read guide →Bearer auth, OpenAI-compatible format. Fast and affordable, runs on EU infrastructure.
Read guide →Search-augmented Sonar models. For questions whose answers change over time.
Read guide →One key, 200+ models. Switch between GPT, Claude, Gemini and Mistral by changing one word in the body.
Read guide →Wire WhatsApp into your store, payments, CRM and back-office. Many of these already have full guides; more are being added with exact External API Request values.
Shopify, WooCommerce, Wix, Webflow, Squarespace, WordPress, Bubble. Guides coming in G4.
Shopify guide →India's most-used gateway. Basic Auth, payment links, amount in paise, short_url response.
Read guide →Bearer auth, Checkout Sessions endpoint, form-encoded body, for international and domestic.
Read guide →Most platforms hide their integration details behind a sales call or a signup. We are doing the opposite. The plan is to document how to connect WhatsApp to as many services as we can, AI models, payment gateways, ecommerce platforms, CRMs, logistics, accounting, and the long tail of apps reachable through automation tools, each with the real endpoint, the real auth, and a worked WhatsApp example.
Because every guide rests on the same External API Request step, the method you learn once carries across all of them. Learn it on Gemini, and connecting the next service is the same five steps with different values. That is what makes this practical rather than overwhelming.
APIs change. Providers move pages, rename things, retire model versions. Our guides are written concept-first and link to each provider's live documentation for the parts that drift, so when something moves, you can still follow the method and find the new value. Where a guide names a specific version, the provider's own docs are always the final word.
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