> For the complete documentation index, see [llms.txt](https://docs.iyzico.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.iyzico.com/urunler/paypos-app2app/app2app-entegrasyonu/odeme-baslatma.md).

# Ödeme Başlatma

Bu servis, Paynet tarafında gerekli ayarların yapıldığını kontrol ettikten sonra işlem için gerekli
\
olan deeplink\_url’i ve daha sonra Müşterinin Mobil Uygulamasına dönen encrypt edilmiş veriyi
\
decrypt etmek için kullanılacak encryption\_key’ini döner. Servise istek gönderilebilmek için mobil
\
oturum anahtarı(session\_key) kullanılmalıdır.

## POST /v1/softpos/init\_sale\_transaction

> Satış Başlatma – init\_sale\_transaction

```json
{"openapi":"3.0.3","info":{"title":"PayPOS (Paynet) API","version":"1.0.0"},"tags":[{"name":"SoftPOS"}],"servers":[{"url":"https://api.paynet.com.tr","description":"Production"},{"url":"https://pts-api.paynet.com.tr","description":"Sandbox"}],"paths":{"/v1/softpos/init_sale_transaction":{"post":{"summary":"Satış Başlatma – init_sale_transaction","tags":["SoftPOS"],"parameters":[{"name":"Session-Key","in":"header","required":true,"description":"Mobil oturum anahtarı","schema":{"type":"string"}},{"$ref":"#/components/parameters/ContentTypeHeader"}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"$ref":"#/components/schemas/InitSaleRequest"}}}},"responses":{"200":{"description":"Başarılı","content":{"application/json":{"schema":{"$ref":"#/components/schemas/InitSaleResponse"}}}},"400":{"description":"Hata","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}}}}}},"components":{"parameters":{"ContentTypeHeader":{"name":"Content-Type","in":"header","required":true,"description":"İçerik tipi.","schema":{"type":"string"}}},"schemas":{"InitSaleRequest":{"type":"object","properties":{"amount":{"type":"number","description":"Tutar."},"add_commission":{"type":"boolean","description":"Komisyon eklensin mi?"},"instalment":{"type":"integer","description":"Taksit."},"card_holder_phone":{"type":"string","description":"Kart sahibinin telefon numarası."},"card_holder_mail":{"type":"string","description":"Kart sahibinin e-posta adresi."},"description":{"type":"string","description":"Açıklama."},"reference_no":{"type":"string","description":"Referans numarası."},"selected_agent_id":{"type":"string","description":"Seçilen Bayi Id'si"},"callback_url":{"type":"string","description":"Deeplink ile mobil uygulamaya geri dönülecek adres."}}},"InitSaleResponse":{"type":"object","properties":{"payment_session_id":{"type":"string","description":"Payment Session Id."},"deeplink_url":{"type":"string","description":"Deeplink adresi."},"encryption_key":{"type":"string","description":"Şifreleme anahtarı."},"object_name":{"type":"string","description":"Obje türü."},"code":{"type":"integer","description":"Sonuç kodu."},"message":{"type":"string","description":"Sonuç mesajı."}}},"ErrorResponse":{"type":"object","properties":{"object_name":{"type":"string","description":"Obje türü."},"code":{"type":"integer","description":"Sonuç kodu."},"message":{"type":"string","description":"Sonuç mesajı."}}}}}}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.iyzico.com/urunler/paypos-app2app/app2app-entegrasyonu/odeme-baslatma.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.