REST APIs · Integrations · Los Angeles
Your booking tool, your ERP and your payment processor all have an API. Somebody just has to make them agree.
A REST API is the door a software product leaves open for other systems: send a request to a URL, get structured JSON back. Our Glendale-led team reads the vendor’s documentation, sets up the login handshake, maps each field into Zoho CRM, Zoho Books or Zoho Desk, plans for rate limits and outages, and keeps a log of every call so a missing record can be traced in minutes.
Advanced PartnerZoho APIs are our daily work
01When a custom API build fits
Sometimes yes, sometimes a ready-made connector is the smarter buy. A custom integration earns its keep when data moves often, the rules are specific to your business, and a lost record costs real money. We sort every request into one of these two piles on the first call.
200Build it
303Look elsewhere first
02REST API services
The code is usually the smallest part. Most of the effort goes into reading the other vendor’s rules, agreeing which system owns which field, and deciding what happens when a call fails at 4 AM on a holiday.
We go through the vendor’s docs, sandbox and changelog, list the endpoints you actually need, and note their paging, filters and quirks before a single line is written.
/discovery
Small services on Zoho Catalyst or AWS Lambda that call both APIs, transform the data and write it where it belongs, with tests your next developer can run.
/build
OAuth 2.0 flows, API keys and signed requests set up properly. Refresh tokens sit in a secrets store, never in a spreadsheet or a Deluge script comment.
/auth
Batching, backoff on 429 responses, cursor paging and Zoho CRM’s bulk APIs for the first big backfill, so you stay inside every vendor’s daily allowance.
/limits
Every request and response stored for a set period, an alert to a named person when errors pile up, and a way to replay failed records once the cause is fixed.
/monitor
The script a former contractor left on a server under a desk. We document what it does, move it somewhere supported and retire the parts that no longer matter.
/legacy
03Spec to monitoring
Below is the build log of a sample project: a home-services company’s booking app feeding Zoho CRM and Zoho Books. Names and numbers are made up; the order of the work is the one we follow. Scroll and the terminal fills in.
The booking vendor publishes an OpenAPI file. We pull it, list the five endpoints that matter and flag that jobs page 50 at a time with a cursor.
# what does the vendor give us? $ openapi inspect booking-api.yaml --tag jobs,customers endpoints 38 total, 5 in scope paging cursor, limit max 50 auth OAuth 2.0 client credentials ✓ spec saved to /docs/booking-api.md
Zoho uses OAuth 2.0 with short-lived access tokens and a long-lived refresh token. Both sets of credentials go into a secrets store the day they are issued.
# tokens, never pasted into code $ secrets put zoho/refresh_token (scope ZohoCRM.modules.ALL, ZohoBooks.invoices.CREATE) $ secrets put booking/client_secret $ auth test --all ✓ zoho access token issued, expires in 3600 s ✓ booking 200 GET /v2/me
Sales, dispatch and the bookkeeper sign off on each line: which booking field lands in which Zoho field, and which side wins when both change.
# map v3, signed off by ops and finance customer.email → Contacts.Email dedupe key customer.last_name → Contacts.Last_Name required job.total_cents → Deals.Amount ÷ 100 job.status=completed → Books invoice one per job ! job.tech_notes has no home yet, parked for phase 2
Fifty test bookings go through a Zoho CRM sandbox. Two fail, which is exactly why we test: one phone number in a format the validator rejects, one customer with no last name.
$ sync run --env sandbox --source fixtures/50-jobs.json 48 upserted 0 duplicates ✗ 2 rejected INVALID_DATA Phone · MANDATORY_NOT_FOUND Last_Name $ sync run --env sandbox --only-failed ✓ 2 upserted after cleanup rules
Old records travel once through Zoho CRM’s Bulk Write API rather than thousands of single calls. Then the live sync starts, polling every five minutes and listening for webhooks.
$ backfill --since 2024-01-01 --via bulk-write job 1 of 3 contacts.csv uploaded, processing ✓ backfill complete, 0 skipped rows $ sync enable --env production --poll 5m --webhooks on ! 429 Too Many Requests from booking API · waiting 2 s · retried ✓ live
The booking vendor goes down for twenty minutes on a Tuesday. Calls queue, the on-call person gets one alert instead of two hundred, and the queue drains itself when the vendor is back.
✗ 503 Service Unavailable × 12 booking API ! alert sent to ops-oncall (1 message, grouped) queue holding 37 events, oldest 19 min ✓ vendor back · 37 replayed in order · 0 lost $
04Try it · sample payloads
Pick a sample source system, then point each incoming field at a Zoho CRM field. The right side writes the request body we would send and flags the mistakes we see most in real projects: a required field left empty, two fields fighting over one target, money sent in cents.
POST
Sample fields and values. A real map also covers custom fields, picklist values, time zones, deletes and which system wins a conflict, and it is signed off before go-live.
05REST APIs + Zoho
Almost every Zoho app has a REST API, and Zoho can also call out to other APIs from its own workflows. That gives four shapes we build again and again, picked by direction and volume.
InOutside app → Zoho
Zoho CRM upsertOur service pulls new records on a schedule or receives them by webhook, cleans them, and upserts into Zoho CRM using a duplicate-check field so reruns never create twins.
OutZoho → outside app
Workflow ruleA deal closing, a ticket escalating or an invoice going overdue calls another system straight from Zoho with a Deluge function, for jobs small enough to live inside Zoho.
MoneyBilling system ↔ Zoho Books
Zoho Books invoicesInvoices, payments and credit notes posted into Zoho Books with the right customer, tax and account, and payment status read back so sales sees who has paid.
LightSimple hops, no code
Zoho Flow custom appWhen volume is low and the logic is simple, we wrap the API as a custom app inside Zoho Flow so your admin can change the steps without a developer.
06What an API integration costs
There is no list price for an API, so we won’t print one. What you pay splits into three bills: what each vendor charges for API access, what the small service costs to host, and our build. Here is what moves each one up or down.
The first call costs nothing. If an integration touches many systems, we may suggest a short paid discovery to read every API properly, and we tell you its price before it starts.
07REST API questions
Limits, logins, connectors versus custom code, and what breaks. If you have the other vendor’s API docs, send them before the call.
It is a small piece of software that moves data between two systems by calling their REST APIs, which are web addresses that accept requests and return JSON. For example, when a job is booked in your scheduling app, the integration reads it through that app’s API and creates or updates the matching contact in Zoho CRM through Zoho’s API.
All three. Most modern vendors offer REST, some add GraphQL so one query can fetch nested data, and older banking, insurance and ERP systems still speak SOAP with XML. Zoho’s own APIs are REST. We work with whatever the other system exposes and translate it into Zoho’s format.
Start with the native connector if Zoho or the vendor already ships one and it covers your fields. Choose a custom integration when no connector exists, when your rules are specific, when volumes are high, or when you need a full log of every record. We will tell you on the first call if a connector is enough.
Zoho Flow suits low-volume, simple jobs such as posting a form entry to Zoho CRM, and your admin can edit it without code. A custom service on Zoho Catalyst or AWS Lambda is better for large backfills, complex transformations, strict retry rules and detailed logging. Many setups use both.
Yes. Zoho CRM gives each organization a daily pool of API credits that depends on the edition and the number of user licenses, counted over a rolling 24 hours, plus a limit on how many calls can run at once. Single calls handle up to 100 records, and bulk APIs exist for big imports and exports. We design around these from day one.
Credentials go into a secrets store on Zoho Catalyst or AWS, never into code, spreadsheets or email. For Zoho we use OAuth 2.0 with the narrowest scopes the job needs; the short-lived access token is refreshed automatically. When someone leaves, tokens can be revoked without rebuilding the integration.
Requests that fail are queued and retried with growing waits instead of being dropped, and a named person gets one grouped alert. When the API recovers, the queue replays in order. Every request and response is logged, so we can show exactly which records were delayed and confirm none were lost.
Sometimes. Many systems have a private or partner API you can request access to, a scheduled CSV export, an SFTP drop or email notifications we can parse. Each option is slower or more fragile than a real API, and we explain that tradeoff before you commit to it.
It depends on the number of systems and endpoints, the quality of the vendor’s documentation and how much history needs to be backfilled. We agree the scope in a BRD with a delivery schedule that dates each milestone, from first sandbox call to live sync and monitoring.
You do. The code lives in your Zoho Catalyst project or your AWS account, with the field map, setup notes and a runbook for common errors. If you later hire your own developer, they can pick it up without us.
08How an API project starts
A two-system integration with good documentation can often be scoped from the first call. When the vendor’s docs are thin or several systems are involved, we read the APIs in a short paid discovery first.
API work happens over screen share and shared docs for teams across the US, Canada and Latin America; for a kickoff in the Los Angeles area we can come to you.
Once the BRD is signed, the build follows our usual schedule-led delivery. See how we work →
09Let’s talk
Book a free consultation with Elite Tech Global. We review your Zoho, AWS, Shopify or WordPress setup, show where AI / SI agents can save time, and agree the next step. If we work together, every requirement and a fixed price go into a signed BRD before the build starts.
Real people, one team. Led by co-founders Ikramul Karim and Khris Kakosimidi, and a 40+ member team across Zoho, AWS and AI.
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